Which are the Best Tankless Water Heaters for a Home with 3 Bathrooms?

Which tankless heaters are best for large homes? Different situations call for different approaches. If you have a new home or an older home, if you have the ability to run new electric service to the 3 bathrooms, is natural gas your best energy source in your area. In many cases a large-capacity gas-powered tankless heater is best when you’ve got 3 bathrooms, a laundry room, full kitchen, etc. Here at Tankless Guide we have picked possible the best 3 of the best large-capacity tankless models currently available for you to review.


Bosch 2700 Aquastar Tankless Water Heater


Bosch makes highly-rated tankless heaters, and this one can deliver 7 gallons per minute, or GPM, of continuously flowing hot water. That flow rate should be enough to handle the demands of 3 water locations in use at the same time, 2 if one of them is filling a bath tub or jetted tub with hot water.


This is a fairly compact unit that can be installed on any wall, reducing the amount of space required. It features electronic ignition, so it only fires when needed without a pilot light wasting energy. The gas valve is modulating which means the system uses sensors to know exactly how much heat is required, reducing energy use and cost. With an Energy Factor of .82, most homeowners report using 30% to 40% less energy to heat water in their homes with this model.

Bosch backs the heat exchanger with a 12-year warranty, but offers just a 2-year warranty on all other parts.



Rinnai RC98HPi Tankless Water Heater


Rinnai has the most respected name in the industry, and this unit shows why that’s true. The .94 Energy Factor is very high, as is the 96% efficiency when using either natural gas or propane.


The flow rate on the Rinnai RC98HPi is up to 9.8 GPM, so running hot water at multiple locations won’t put a strain on the system. Rinnai backs this model with one of the best warranties in the industry. The heat exchanger is covered for 12 years and all other parts are backed for 5 years. If there’s a downside to Rinnai products, it is their higher-than-average price. But you do get outstanding quality and performance for the extra money.




Noritz NR111 Tankless Water Heater


With 11.1 GPM capacity, this tankless heater is ideal for large, busy household with a high demand for hot water at peak times. It’s rated for 4 outlets to be in use at once, and with 84% efficiency, will significantly lower your home’s energy use and utility bills. It features a commercial-grade heat exchanger for outstanding durability. For convenience, an optional wireless remote thermostat is available.


This is another expensive water heater, a fact that might turn off some buyers. However, it’s backed by a 12-year heat exchanger warranty and 5-year parts warranty. The quality and performance make it stiff competition with Rinnai.






Which large-capacity tankless heater is right for your home? See our individual reviews of these models, as well as other large, whole-house tankless heaters you might want to consider.

We would be remiss if we did not also include the Rheem RTG95 is a 9.5 GPM unit that is certainly worth a look



The four listed here, and others we review, will put an end to the hot water shortages in your home, even when it’s in high demand.




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