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Question DetailsAsked on 11/12/2014

what is the best natural gas tankless water heater? looking for indoor but will take both suggestions

i am installing a natural gas in my home and want to get a tankless heater because i dont want to waste room with the tank just want to know what brand and size are recommended for a 3000 sqft house with 2 bath one sink in kitchen and washer connected to heater. the two bathrooms are on the opposite side of the house than the heater. it is just the 2 of us now but do plan on having children. thank you

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Rinnai is by default accepted to be the best. Energy factor i.e. efficiency is higher than most competitors. Very low activation flow rate at 0.4 gpm and stays on even at 0.25 gpm. That should bar any cold water sandwiches. Rinnai is also accepted as the most reliable brand.

Other great options are Rheem and Navien.

Note that putting the water heater far away from the bathrooms can cause some delay in getting the hot water. One of the advantages of tankless is you have more options to place it because it is so compact. In the South, you can even put them right outside the bathroom wall with not need for venting and instant access to hot water at the shower.

For all tankless water heaters, make sure to take it from an authorized dealer and have it installed properly by a professional who is certified by the manufacturer.

As for the size, check out how many BTUs it has. Most of the gas tankless water heaters should have enough BTUs for two showers and a sink but it is still best to plan throughly. This article has some valuable info on sizing tankless water heaters:


Answered 5 years ago by tedtheted

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