What Size Tankless Water Heater Do I Need?

Many homeowners know that a tankless water heater is the smarter choice (read our guide to find out why), but it can be hard to discern between the different makes and models. That’s why we’ve put together this quick guide to calculating which water heater size is right for your home.

Why Choosing The Right Size Is Important

Tankless water heaters provide instant hot water and can support multiple appliances, but this is only true if you choose the right size. Too small and you won’t be able to use the heater as intended; too large and you’ll be wasting money on extra power. So it’s important that you choose a model that can handle the maximum gpm (gallons per minute) that you would ever use.

How To Calculate What Size Tankless Water Heater You Need

Figuring out the correct size just takes a little bit of math: find out the average flow rate for any appliances you might use at the same time and add them together. For example, if you have two showers that will be used at the same time, you need a heater that can handle 5 gpm (2.5 gpm + 2.5 gpm) or more. Here are some common flow rates:

ApplianceGPM (gallons per minute)
Hot Shower2.5 gpm
Kitchen Sink1.5 gpm
Dishwasher1.5 gpm
Washing Machine2.0 gpm

Source: EPA

An Economy Water Heater Is Great For Couples Or Small Families

Our economy model tankless water heater is cost-effective and provides 6.5 gpm, so you can easily shower and run the washing machine at the same time. It’s perfect for single homes, couples, or families with one child.

High Efficiency Plus Models Provide Enough Hot Water For Most Families

If you’re a family of four, or you frequently use two showers at once, our high efficiency plus model might be the better option. It’s capable of 7.5 gpm so you can enjoy multiple showers and an appliance at the same time.

The Super High Efficiency Plus Is Strong Enough For Large Families

Our most powerful option, the super high efficiency plus model, provides 11 gpm which is enough for most large families. You’ll never have to worry about running out of hot water in the middle of a shower again!

rinnai tankless water heater

Get A Rebate On Your Tankless Water Heater From Euliss

Whatever size you choose, our team is here to help! We have decades of experience installing top class Rinnai water heaters, and we even help you get all applicable rebates. You could get an instant $250 rebate just by choosing us! If you’re interested in a tankless water heater in Guilford County, Randolph County or beyond, get in touch.

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