Are you thinking of switching from a tank water heater to a tankless one? Then, you’re probably making the smartest decision of your life. The tankless water heater is highly efficient than the traditional storage-tank style heater. It not only saves energy up to 34% but also ensures a continuous supply of on-demand hot water.
Moreover, a good tankless water heater lasts more than its tank-style counterpart. It takes up less space and also requires less maintenance than the heater with a storage tank. But is that all you need to know about buying a tankless water heater? No, there’s more information that we think we should share to help you make the right selection. In this buying guide, we’ll discuss a few factors to assess your home’s specific water heating needs. And we are also going to look at some of the top-rated tankless water heaters that can meet your requirements and budget. It’ll allow you to compare the options available from all the top brands that we’re going to discuss.
Answering The FAQs
How Does a Tankless Water Heater Work?/ How Tankless Water Heaters Work?
Tankless water heaters use direct heating technology that doesn’t require the use of any storage tank. With this heater, once you turn on the hot water tap, the cold water starts traveling through a pipe into the heating unit. It includes either an electric element or a gas burner to heat the water. As a result, these water heaters can deliver hot water supply continuously.
Is a Tankless Water Heater Right For You?
The tankless water heater is the right choice for you only if the daily hot water usage amount is 41 gals or less. Since the tankless water heater doesn’t heat and maintain a large storage tank’s water, it uses less energy and costs less. So it allows you to save on both the cost and energy being a limited user of hot water.
What is a Tankless Water Heater?
A tankless water heater is a heating unit that heats water directly without requiring any storage tank, thus supplying endless hot water on-demand. There’s a gas or electric element in this heater that heats the cold water traveling into that unit.
How to Install a Tankless Water Heater?
Installing a tankless water heater is a sophisticated job and needs a professional plumber to complete it. The installation process requires you to turn off the electric or gas connection to the hot water tank at first. Then you’ve to drain the water out and remove its old tank. If the heater is gas-based and requires more extensive gas lines, use a gas pipe to connect from the gas meter to the heater. Now use the hole saw and drill a hole outside your house where the heater will be placed. Run PVC pipes to ensure fresh air intake and ventilation through the hole. Then connect the cold water supply line and the water heater while putting the hotlines out of the heater with the ¾” copper pipe. The on-demand water heaters may require an electrical outlet, so make sure to have one with an electrician’s help. Finally, turn on the gas supply or electricity supply, cold water supply, and the heater’s power to test the system.
Tankless Water Heater Installation: Is It Worth It?
The upfront cost of installing a tankless water heater is high; however, its energy efficiency can save your cost up to $75 per year compared to the tank-style ones. If you don’t need to deal with multiple tasks with hot water at a time and the overall requirement is less than 41 gallons per day, we think installing a tankless water heater is worth it for you. But if you require a more considerable amount of hot water to deal with multiple jobs or have a limited upfront budget, it’s better to go for the storage tank water heaters.
What Size Tankless Water Heater Do I Need?
Generally, if you do any single task like running a shower or washing machine, a point of use tankless water heater with a capacity of 2.5 GPM should be enough. But if you run two showers or a shower and a washing machine simultaneously, you would need at least a 4.5 – 5 GPM capacity tankless water heater.
Tankless water heaters: electric or gas?
Tankless water heaters run by gas or electricity are more efficient than conventional water heaters. In fact, gas model water heaters are more energy-efficient than electric model ones. On the other hand, electric run ones are easier to install & maintain and have less upfront cost than the gas model ones.
What are the Pros and Cons of Tankless Water Heaters?
There are many pros or advantages of using a tankless water heater over the traditional tank-style ones.
The most important advantages include high energy efficiency, long term cost savings, space savings, eco-friendly construction, excellent longevity, endless on-demand hot water supply, and so on.
Talking about its cons or disadvantages, you’d find, its high upfront cost for installation as they’re more expensive, the complicated installation procedure that requires expert supervision; limited flow rate for large-scale use.
How Long Do Tankless Water Heaters Last?
Most tankless water heaters generally have a service expectancy of over 20 years. On the contrary, the storage-style water heaters last around 10–15 years.
Understanding Frequently Used Terms
You’ll find some frequently used terms in this review article. We’ll write a short note for these terms to make this guide a more convenient one to read and understand.
Point of Use Water Heaters
Point of Use Water Heaters refers to the tankless water heaters that have limited use, and the water is heated very near to the place of service as a sink or shower. These heaters don’t include any central heater.
Endless Hot Water
The tankless water heater doesn’t require any storage tank and works on an on-demand principle to provide a continuous water supply from the central water reserve of your home.
Hot Water On-Demand
Getting hot water on-demand is only possible with the tankless water heaters as they can supply hot water whenever you need it.
Tankless Water Heater Cost
The tankless water heater cost is an important topic to cover. The cost varies based on the brand, model, specifications, and features. However, a reasonable tankless water heater cost starts at $120 and can be as much as $1500.
Top 10 Tankless Water Heater Reviews
Stiebel Eltron Tankless Water Heater – Tempra 24 Plus – Electric, On-Demand Hot Water
The Stiebel Eltron Tempra 24 Plus Tankless Water Heater is an exclusive option we have on our list for the best tankless water heater. It’s an electric on-demand water heater that comes with superior engineering to ensure endless water flow. We’ll find out more about this product below.
Patented Technology For Continuous Flow
The Tempra 24 Plus features the Advanced Flow Control™, a German Patented Technology invented by the Stiebel Eltron. It maintains the water temperature automatically for persistent comfortability. If the demand for hot water exceeds capacity, it’ll automatically reduce the flow slightly. So your hot showers won’t be interrupted again.
Space-Saving Design W/ Convenient Operation
It comes with a sleek and small space-saving design with a white finish. Although it’s compact, it ensures an endless water supply for your entire home without requiring any venting. It also features a noise-free operation.
A reliable and robust copper interior heating system includes electronic flow sensor switches to ease the operation. Moreover, there’s a digital temperature display for users’ convenience. Preset temperature memory buttons are a plus for the parents out there.
Extremely Energy Efficient
The Stiebel Eltron tankless water heater is an eco-friendly unit that saves energy with auto-modulation technology and the ability to measure water flow electronically. There’s also a saving monitor that shows the amount saved on energy costs. This heating unit usually consumes 15-20% less energy than other electric tank water heaters used to standby heat loss. It’s also efficient because it doesn’t require any vent to the outdoors like the tank water heaters run on gas or oil.
The Tempra 24 Plus model specifications include 24kW and 240V/208V, requiring a minimum recommended household electronic configuration 150 A. It offers an output water temperature ranging between 86˚ to 140˚F. And most importantly, the company backs its product with a super effective warranty policy.
What Customers Say
Stiebel Eltron is a reliable name in the industry, and the Tempra 24 Plus Tankless Water Heater lives up to the expectations completely. It comes with super convenient operation, a decent price tag, and superior technology to ensure an entire home’s endless hot water supply.
Ecosmart ECO 18 Electric Tankless Water Heater, 18 KW at 240 Volts with Patented Self Modulating Technology
The EcoSmart from Rheem comes up with its ECO 18 Tankless Water Heater to let you enjoy everyday living with the warmth of continuous on-demand hot water. EcoSmart tankless water heater comes with a bunch of features to ensure a safe & reliable water-heating solution. Let’s check out some of these below.
Why use extra space with the traditional tank heaters when you have EcoSmart’s sleek and smart wall-mounted tankless water heater. You can save up to 12 cubic feet of space to free up some for additional storage. This water heater unit is 90% smaller than its tank-style counterpart.
Save Energy, Money, and Time
EcoSmart water heater saves energy with its Advanced Self-Modulating Technology that uses the energy for heating water only when the users need hot water. So it can save up to 60% on water heating costs. You can also save time as it uses on-demand heating and point-of-use installation to cut down on your waiting time for hot water.
EcoSmart ECO 18 features an 18-Kilowatt tankless electric hot water heater, a “Whole Home” model. And that makes it an ideal option for providing hot water in the condominiums, apartments, townhomes, and similar whole-home applications. EcoSmart shares the warmth on-demand, consistently, and endlessly.
The ECO 18 comes with a tremendous on-demand hot water capacity. It can produce hot water in the range of 1.8 to 4.3 GPM based on the inlet water temperature. It’s equivalent to one sink and one water saver shower head with an incoming water temperature of 62°F and above, and an output setting of 105°F.
Digital Temperature Control
It also provides excellent convenience of operation. The digital temperature control allows you to control the temperature in the range of 80 – 140° F, where users can set the temperature in increments of 1°. So it gives the user complete control to produce endless hot water while only consuming the energy required.
The Eco 18 comes with superior engineering that includes a water heater and a scale inhibition system. It’s a highly durable product with maximum convenience of operation. Copper and stainless components are built to last. And the company backs their product with a lifetime warranty for home users.
What Customers Say
ECO 18 Tankless Water Heater is a top-quality product. As an on-demand water heater, people like its features such as compact design, high energy efficiency, great capacity, durable construction, and so on. The users also love the price of less than $400 for this fantastic water heater.
Rinnai RU199iN Sensei Super High-Efficiency Tankless Water Heater, 11 GPM – Natural Gas: Indoor Installation
Rinnai Sensei Tankless Water Heater is the next addition to our list. It’s an easy-to-install tankless heater that includes all Rinnai manufactured vital components. So the company promises super high efficiency and enhanced user experience with this water heating unit.
Endless Hot Water
You don’t need to schedule your hot water requirement with the Rinnai tankless water heater. Now you can take a piping hot shower, run the dishwasher, and do a load of laundry, and not run off hot water all at the same time. You get endless hot water for the entire family just when you need it.
It’s a super high efficient tankless water heater that can provide hot water at a flow rate of up to 11 GPM. It uses ThermaCirc360 Technology to recirculate hot water through the pipes to get the hot water rapidly. So no more waiting for the hot water to travel from the old tank to your shower. And it also helps to stop wasting the water.
With the compact design of this water heating unit, you can save valuable space. You can even install it in non-traditional places such as crawl space, attic, or a closet. Its size is similar to a small suitcase, and you can save up to 16 square feet of space.
Affordable & Efficient
The RU199iN is an affordable tankless water heater. Moreover, it’s a super-efficient heating unit in a compact package that cuts CO2 emissions to conserve more water and use less energy. So it uses 40% less energy than the traditional tank-style water heaters.
When you talk about gas tankless water heaters, Rinnai makes it to North America’s most trusted brand. The innovative design and surpassed quality give you peace of mind. The manufacturers use smart technologies like WiFi monitoring to monitor the efficiency of their products. The replaceable components allow you to swap instead of buying a new system easily. The life expectancy of the system is more than 20 years. So it’s not only reliable but also sustainable as well.
What Customers Say
The Rinnai RU199in – Natural Gas Model comes out as one of the most loved tankless heaters on Amazon. It’s an easy-to-install unit with excellent water supply capacity. The operation is convenient, and the price is also reasonable. So there are some excellent reasons why people like this tankless water heating unit so much.
GIRARD 2GWHAM Tankless Water Heater
The GIRARD 2GWHAM Tankless Water Heater is the culmination of years of R&D by the company. Girard understands the customer requirements to incorporate them into this new RV Tankless Water Heater. It comes with all the cutting-edge features to ensure an endless hot water supply for your family. Let’s check out more about this item below.
The Girard comes with 12V power that can operate at less than 3 Amp. The 42,000 BTU ensures optimum performance for the plumbing of an RV. It regulates the burner to maintain a constant hot water temperature. It doesn’t require any LP gas line or special plumbing. The unit also includes a Freeze Protection feature to ensure safe winter use.
Continuous Hot Water Flow
Girard Tankless Water Heater is an easy-to-operate unit. All it requires is to turn the hot water on and add the cold water to the desired temperature for an endless on-demand water flow. It’s Onboard Microprocessor monitors the approaching cold water temperature, the water flow rate, and the departing hot water temperature to maintain a consistent and steady flow of hot water.
Easy Operating Functions
It comes with a State-of-The-Art interior wall-mounted digital temperature controller that shows the operating functions. It also allows the users to set temperature in the range of 95°F to 124°F, or equivalent Celsius unit. Parents can use the preset function to set a lower temperature to ensure safety for the kids. You can also troubleshoot in case of any issue with its UCP featured visual diagnostics.
There’s also a convenient water heater door that’s easy to open & close (not included). It has sliding latches and not those complex twist-latches. The hinged door & sliding latches allow rapid and easy access to the heating unit. It also has a silicone exhaust ring that moves for the convenient alight of its exhaust tube.
What Customers Say
The GIRARD 2GWHAM Tankless Water Heater is a highly reliable unit owned by many happy home and RV owners. People love that it’s a highly efficient unit for energy, cost, and on-demand hot water capacity. It’s an easy-to-install heater with excellent convenience of operation. Plus, the price is reasonable as well to make it a must check out option for any user.
Rinkmo Electric Tankless Water Heater 18KW 240V Instant Hot On-Demand Residential Electric Water Heater for Bathroom Bathtub RV Whole House Shower Sink Small
It’s time to check out the Electric Tankless Water Heater from Rinkmo. It’s a safe and efficient tankless water heater to ensure an endless hot water supply for your whole house. Let’s find out more about this item here.
The Rinkmo on-demand water heater comes in a space-saving design. So you can place this compact, easy-to-install unit in any non-traditional space like the basement, utility room, attic, garage, crawl space, or a closet. It weighs minimal and comes in a sealed package. So it makes it simple to get you started for endless hot water.
The Rinkmo Electric On-Demand Water Heater is a fireproof unit that comes with high-quality sheet metal shells. There’s a digital screen that displays actual outlet water temperature. It automatically stops if there’s no water to heat. The 18KW system adapts two voltages of 240V/208V. It also includes a cleanable filter and Electricity Heating Separate along with the Original Technology-Water Pipe.
Endless Hot Water
With the Rinkmo on-demand water heater, why worry about hot water for a long shower! Or, bother to preheat or wait for any delay to get the water hot at the crucial time! With this heating unit, you can get started in just 3 seconds by simply turning your tap or shower. It also comes with a great capacity to run both the shower and dishwasher/washing machine unit without any issue (up to two showers and three faucets at the same time).
Stable Water Temperature
It features a Smart Modulating Technology & Formula for calculating the difference between the desirable temp and the current temp. So it can adjust power input based on temp settings and flow rate & temp setting in time using the Rinkmo’s smart flow sensors and high-quality temperature sensors. So you can get a stable water temperature without any sudden temp changes, instead of scalding hot water while reducing flow rate or lowering water pressure.
An auto protection feature allows the system to cut off immediately once it detects the outlet temperature of 167° F or 75° C. The reminder for abnormal temperature will alarm when the inlet water temperature is less than 37° F, or the outlet temperature is less than 167°
Save Time & Money
It’s a super-efficient water heater with a 99.8% energy efficiency. As it requires no preheating, you’d find the water heating cost is reduced up to 60%. The system avoids standby loss, and there’s no mineral buildup in it that saves you money on future maintenance costs.
What Customers Say
The Rinkmo Electric Tankless Water Heater seems to be an exciting on-demand hot water supply solution for many homes and commercial places like apartment, hotel, barbershop, salon, gym, and so on. There are almost zero complaints regarding its durability, performance, and price; making it an ideal option to go for.
Rheem 240V Heating Chamber RTEX-13 Residential Tankless Water Heater
When you talk about tankless water heaters, you can’t miss out on the Rheem’s Professional Classic® Tankless Electric Water Heater. It offers continuous hot water on-demand and produces it quickly for multiple applications or single point-of-use. Here we have more of its features to check out.
Reliable Brand For Water Heaters
Rheem Manufacturing Company is a 100-year-old company providing different electronic solutions for heating, cooling, and refrigeration for home and commercial applications. The tankless water heater we have here is an excellent demonstration of how good their product line is. So when it comes to reliability for an on-demand water heater, Rheem is a name to remember.
Excellent Heating Elements W/ Thermostatic Control
The Rheem water heater comes with long-lasting copper immersion with a couple of heating elements. It has a serviceable field with Self-Modulating Power Control. It heats instantly, so you won’t have to wait even a minute with this shower water heater. You can also pass a great time using this as a bathtub water heater.
There’s also an external thermostatic control that’s compact and adjustable as well. The stylish LED display comes with a rise of the 1°F range.
Another good thing about this heating unit is its simple installation procedure. It takes minimum effort and time to get you going for your instant hot water requirement. For more convenience, it comes with the ½ NPT adapters and side ½-inch compression water connections.
High Energy Efficiency
This residential electric tankless water heater is 99.8% energy efficient. So it avoids standby heat loss and saves water and cost in the long run. With a price like that, you can’t get anything more efficient than this.
It’s a threaded water heating unit that provides ease of replacement. The digital temperature display of 54A allows temperature adjustment in an increment of 1°F. This 13kW model supports 240V voltage and has a flow rate of up to 3.17 GPM.
What Customers Say
Considering the price, prospect, and valuable service, customers, find the Rheem 240V Tankless Water Heater to be a real deal. It’s easy, efficient, and performance-oriented, which makes people happy with their purchase.
Noritz NR50ODNG Outdoor Tankless Water Heater, max. 120,000 Btuh, 5.0 Gpm – Natural Gas
When talking about the outdoor tankless water heater, you’ve to count on The NORITZ NR50ODNG. Noritz is a trusted name in the water heating industry for years now. And the NR50ODNG carries on this incredible legacy for them. Let’s find out more about this item below.
Low Nox Emission
The Noritz NR50ODNG has a low emission rate, probably the least for NOx emission compared to the conventional ones. Its Carbon Reduction Technology makes it an excellent environment-friendly tankless water heater to check out.
Great Capacity & Energy Efficiency
The NORITZ tankless water heater is a 5 GPM tankless water heater designed for endless hot water supply for outdoor applications. So you won’t run out of hot water. It’s also a highly efficient water heating unit with such great capacity that it has an energy factor of around 0.91. So it avoids standby heat loss by supplying on-demand hot water and saving on energy, water, and cost in the long run.
Light Weight & Simple Installation
It’s a 33 lbs tankless water heater that includes simple installation procedures. It comes with a wall-mounting option for maximum convenience of use. So all you need is to plug into the house current, turn on the water heater, and it’ll do the rest for your endless hot water supply.
To ensure endless hot water, the Noritz NR50ODNG comes with some excellent specifications. It has a fuel type of natural gas with a capacity of 12,000 BTU. The flow rate is 5 GPM, and the energy factor is 0.91. It also comes with an excellent warranty policy to make it more convincing to the users.
What Customers Say
Noritz NR50ODNG Outdoor Tankless Water Heater is an expert’s choice system to ensure continuous hot water for an entire home. It comes with excellent specifications and does the job as advertised. So you’d see people rarely find any issue with its performance—all in all, a great value product for anyone looking for an efficient tankless water heater.
Camplux 5L 1.32 GPM Outdoor Portable Propane Tankless Water Heater
Now it’s time to discuss the most reliable point-of-use, outdoor tankless water heater. It’s the Camplux AY132 5L Portable model. This portable water heater helps people get happiness and enthusiasm in their outdoor life. So check out this incredible item that can provide you with an efficient and easy outdoor lifestyle.
CAMPLUX Outdoor Tankless Heater comes into the market with the hands of JAL Group, a leading manufacturer of home appliances that emphasize portability, innovation, and energy savings. The company promises to help you enjoy your outdoor life better, and this particular on-demand water heater is an excellent demonstration of their vision.
Perfect For Outdoor Activities
The Camplux AY132 is an excellent tankless water heater for outdoor activities such as camping at the beach or making a family vacation to the mountains or cabins. You can also make the most of this on-demand water heater for outdoor showers or bathing horses, dogs, etc. It runs on both the electricity and 2 “D” cell batteries. So you can turn the ignition on with the batteries whenever you run out of electricity.
You can’t use this tankless gas water heater for drinking water and not elevate it above 2000 ft.
Easy Specifications, Easy Operation, Great Performance
The Camplux AY132 is the lowest water pressure startup, and it operates on low water pressure ranging from 3-110 PSI, ensuring excellent performance. The water heater works great on modified water systems using a 12V water pump. It has an operating propane gas pressure of 0.4PSI and max power output of 28,000 BTU. The system has a 1.32 GPM water flow rate, sufficient to supply endless point-of-use hot water. Its max temperature raise is 114.8℉, and the min temperature raise is 46.4℉.
Save Space, Energy, & Cost
The system is compact and comes with a wall-mount option to help you save your valuable storage. It also gives you the portability to take it anywhere to enjoy your outdoor life. It uses the most advanced technology for water heating. And that helps you to save up to 50% energy and cost.
More Convenient Features
There’s more to the Camplux tankless water heater. It comes with the Flame Failure Device, Overheat Protection, Oxygen Depletion Sensor Protection, and Anti-Freezing Protection for maximum safety. You can also install it indoors in a well-ventilated place. Moreover, it takes a simple installation procedure to get started,
What Customers Say
When you talk about portable outdoor tankless heaters, the Camplux AY132 seems to be the best one people can get. The features of this on-demand water heater are completely functional to impress all the outdoorsmen. However, make sure to install it properly to avoid any mishaps.
Titan SCR2 N-120 Electric Tankless Water Heater 220 Volts
For a reliable tankless water heating unit that provides a long lifespan free from issues, you can’t go wrong with the Titan’s SCR2 N-120 Electric Tankless Water Heater. Titan has several point-of-use and larger tankless water heater models. We have a large version here that can provide hot water to a whole apartment or small condo. Let’s find out some of its vital features below.
Titan, a part of Niagra Industries, has soon made it into the top brands for tankless water heaters. The company features unique technology like P.I.D. Controller or Air-Water Deferential Analyzing System that makes it a brand to count on. It specializes in manufacturing electric tankless water heaters and has released several successful water heater series.
Simple Installation & Maintenance
The Titan SCR2 includes a straightforward installation and maintenance procedure like its other versions. You may prefer to hire a plumber to install it; however, you can do it yourself by simply following the instruction manual. Regarding its maintenance, it comes with minimal sediment buildup, and you can even easily clean it yourself. Moreover, the company backs its products with a convincing warranty and after-sales customer support policy to make it a more reliable brand to check out.
Titan N-120 tankless water heater is the newest addition to Titan’s SCR2 series. It comes with the specifications of 11.8 KW, 220V, and 54A. It offers a flow rate of 4.5 GPM that’s good enough to provide continuous hot water for a whole house. This heating unit can achieve a temperature increase of up to 95° F.
Advanced LCD Screen & Sensors
Titan made a fantastic upgrade to its N-120 model’s LCD screen. So you can use it to troubleshoot and analyze more conveniently. There’s also a Dual Micro-temp Sensor and a Manual Resettable Thermostat for additional safety. So you can consider it to be one of the most technologically advanced on-demand water heaters in the market.
What Customers Say
Titan SCR2 N-120 tankless water heater has a lot of happy customers all around. Users don’t seem to be reporting any issue as long as they’ve installed it correctly. Most of the customers are satisfied that it saves space, time, energy, and money. Besides, it’s easy to install and reasonably priced to make it more delightful for the customers.
Eemax EEM24027 Electric Tankless Water Heater, Blue
Eemax EEM24027 Electric Tankless Water Heater produces endless hot water whenever you need it and wherever you need it. It comes with a great capacity and a bunch of features to meet the hot water needs for any residential or commercial use. Let’s take a better look at its features below.
The EEM24027 comes with a great capacity to meet the hot water requirements for an entire house. It has a flow rate of 5.3 GPM and can provide hot water for up to 1 shower & 2 sinks at the same time in colder environments. And in the warmer conditions, it can provide hot water for up to 4 sinks or showers at the same time.
This unit’s specifications include 240V, 27kW, which is more than adequate for an electric tankless water heater. It’d require three dual-pole 40 Amp breakers to provide optimum hot water continuously.
Compact, Visually Appealing Design
It’s a compact on-demand water heater that can save you valuable space. It comes in blue color, so people who are bored with white or silver colors will find this visually appealing for their interior.
Highly Energy Efficient
The Eemax EEM24027 is a highly energy-efficient system that comes with Advanced Self-Modulating Technology. It allows the unit to adjust the energy needed to input based on the requirements of hot water. So it avoids standby heat loss and saves you on water, energy, and money.
What Customers Say
If you’re looking for an excellent electrical tankless water heater, the Eemax EEM24027 can be an ideal option to consider. It comes with all the functional features, and people seem to find it exactly as advertised. The price is also reasonable to give it a try.
We’ve come to the end of this review article for the best tankless water heater. In this article, we’ve tried our best to guide you through all the crucial topics that you need to know before buying an on-demand water heater. Also, we’ve come across detailed reviews of some of the top tankless water heaters to make the selection from.
If we are to pick from these recommendations, we can say all of them are good and can serve you satisfactorily. However, we’d like to help you with some of our top picks by category below.
Best Outdoor Model: The Camplux AY132
Popular Pick: EcoSmart ECO 18
Best Electric Model: Rinkmo
Overall Best: Stiebel Eltron Tempra Plus 24
Best Gas Model: Rinnai RU199iN & Noritz NR50ODNG
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