Whole house tankless gas water heater refers to the heater used for the entire home. It saves money on getting an extra point of use or under sink tankless water heater for kitchen use. The flow rate or capacity must be large enough for whole house use. There are altogether three types of whole house tankless water heaters, including gas model, electric model, and propane models.
Top 4 Best Whole House Tankless Gas Water Heaters
|Rinnai RUC98iN Ultra Series||4.8|
|Rinnai RL75iN Natural Gas||4.6|
Best Whole House Tankless Gas Water Heaters Reviews
After figuring out the basic factors and features of buying best tankless gas water heaters, here we picked out 4 top whole house tankless water heater and made detailed reviews for you:
This unit is a high flow rate whole house gas tankless water heater, maximum water flow rate reaches up to 9.8 gallons per minute, and it meets the demand of three bathrooms in warm areas and two bathrooms in cold areas.
It offers both concentric PVC and a twin-pipe venting so that you have more choice. The efficient rating reaches as high as 0.95, and power requirement ranges from 15200 to 199000 BTU. 2 watt electric is needed only to power the unit up.
The temperature of it reaches to 185 degrees F when used it for a commercial heater. But the extra commercial remote is needed.
- High flow rate
- Commercial and residential use both
- Flawlessly hot water
- Highly energy efficient
- Optional venting options offer
- Need professional to get it installed
- Extra commercial remote is needed for commercial use
Takagi natural gas whole house tankless water heater of this series has a large flow rate, reaching 10 GPM per minute. It is able to support 3 bathroom use easily in warm regions and 2 bathrooms in cold areas. Temperature is not dropped even when you use to shower and the kitchen sink at the same time. Thus it can be regarded as a perfect whole home tankless water heater.
It adopts condensing technology, makes sure that seldom natural gas is wasted in using. And it is highly energy efficient. Besides, It demands 199000 BTU per hour to perform in the best condition.
Maximum temperature of the water reaches as high as 185 degrees F, so it can also be used as the commercial tankless water heater.
- Light weight
- Digital control panel
- Overheat cutoff fuse
- Remote control enabled
- Hi-limit switch to control temperature
- Waiting time for hot water is a bit long
- Temperature falls down in cold regions
The maximum flow rate of this unit reaches 9.4 gallons per minute, able to support 3-4 bathroom use in warm areas and 2 bathroom use in cold areas. It is able to supply endless hot water for you.
It can be used both for commercial and residential water heaters. When used for a residential heater, the temperature range in between 94 degrees F to 140 degrees F. And maximum temperature reaches as high as 160 degrees F when it is used for commercial use.
Compared with the above two whole house gas tankless water heaters, this unit is quite low in thermally efficient, only reaching 0.82.
- High tech outdoor air combustion design
- Smart PC board
- Quiet working condition
- Constantly hot water offer
- No fabric
- Commercial use available
- The venting kits can be a little hard to install
- Fluctuate a bit
The flow rate of the unit is between 0.5 to 6.5 gallons per minute. Which is quite lower compared with the other three recommended whole house tankless gas water heaters, but it is also able to support two bathrooms and multiple faucets at the same time.
The gas consumption is between 15 000 and 120 000 BTU, but the thermal efficient reach up to 93%, which is really high. Together with its low NOx design, this machine is able to save much energy for you.
The maximum water temperature of this unit reaches 140 degrees F, which fits the whole home use perfectly.
- 12 years warranty for heat exchangers
- 2 heat exchangers offer (stainless steel and copper)
- Overall freeze protection
- Optional remote control
- Compact shape
Has the problem of cold water sandwich
Things To Consider Before Getting Best Whole House Tankless Gas Water Heater
There are many things and factors you need to consider before buying a whole home tankless gas water heater.
As the tankless hot water heater is powered mainly by gas, natural gas it uses must be vented outside for safety. If it is installed outside, then there is no need to get vent kits, but if it needs to be installed inside, you need to install venting kits along with the machine. Before buying, make sure what inch of pipe the venting requires and how it should be installed.
2. Flow capacity
If you need to get a gas tankless water heater for whole home use, then the flow rate and capacity must be large enough. Some small flow rate tankless water heaters support one shower and one faucet only, and some are large enough to support endless hot water for multiple bathrooms. So you need to check the flow rate and then decides whether it is suitable for a small tiny home or large 4 or 6 family use.
3. Temperature range
Normal whole house gas tankless water heaters reach up to 140 degrees F, perfectly for residential use of course. But if you need to get it use for commercial, then the temperature range should be much larger than that.
4. Energy efficient
A high energy-efficient tankless water heater can largely reduce the using costs, thus saves much money for your heating bills. But once you get a low energy efficient machine, it means a large amount of natural gas is wasted and more greenhouse gas will be let out to pollute the environment. Thermal efficiency above 0.9 is regarded as the best energy-efficient tankless water heaters.
Whole house natural gas tankless water heater offers hot water for the whole home, but it does not mean all the whole house tankless water heaters are of large size. Some are also made compact and portable, while still having a large flow rate. Before buying, you should also seize the size of the place you intend to install the machine on and decide whether you need a large one or a small one.
Advantages of Best Whole House Tankless Gas Water Heater
With a whole house tankless gas water heater, you do not need to buy and install extra point of use or under sink tankless water heaters for kitchen use. The single whole house water heater meets all the demand of you using hot water. Thus it is more cost-effective.
2. Money Saver
The whole house gas tankless water heater can not only saves money on buying extra under the sink water heater, but also saves much on installation and maintenance. As is known to us, the installation fee is really a large sum of money, if getting a point of use tankless water heater, you need to pay a double installation fee, which is really costly. And so does the maintenance. Thus buying one whole home tankless gas water heater really helps save much money for you.
After buying whole house tankless gas water heater, you install the single one machine at home, and then you can enjoy endless hot water all around your home, no matter you are taking a bath or doing laundry. Because of the fast heating speed of gas water heaters, you need only wait for several seconds and then you get constantly hot water.
The Best Whole House Tankless Gas Water Heaters
|Best Type||Tankless Water Heater|
|Most Powerful one||Rinnai RUC98iN Tankless Water Heater|
|Best one for commercial use||Takagi T-H3-DV-N Tankless Water Heater|
|The most energy efficient one||Noritz NRC661-DV-NG Tankless Water Heater|
Above all are the best whole house tankless gas water heaters reviews recommended for you. For whole home use, the flow rate should be large enough. There are also other types of whole house tankless gas water heaters you can choose on Amazon, please feel free to check the price or get more information on it if you have an interest.