What Size Tankless Water Heater Do I Need For A 3 Bathroom House

While traditional tank water heaters are calculated by your family size a tankless water heater is calculated by the quantity and types of fixtures or appliances it will serve.

What size tankless water heater do i need for a 3 bathroom house. A tankless water heater s. Tankless water heaters are rated by the maximum temperature rise possible at a given flow rate. 3 4 people need a 40 50 gallon water heater. 5 or more people need a 50 80 gallon water heater.

What size tankless water heater do i need for a 2 3 4 bathroom house. Rinnai tankless water heaters are designed to provide maximum performance and efficiency using either a 3 4 or 1 2 gas line as long as sufficient gas flow is available. Below we ve highlighted what size water heater you would need in our example of 6 5 gpm at a 63 f temperature rise. Now before you make your final decision there is one other consideration to make and it s a big one.

If you do the math for 50 temperature rise you need approximately 25 000 btu s per hour per gpm of water required which doesn t take heater efficiency into account but gives a good idea of the size of high efficiency heater needed. Should you stay with a traditional storage hot water tank or go with a tankless water heater. Tankless units work by using built in coils to heat water when you need it meaning you ll always have hot water on demand. Therefore to size a demand water heater you need to determine the flow rate and the temperature rise you ll need for its application whole house or a remote application such as just a bathroom in your home.

This makes these types of water heaters more efficient than traditional storage tank water heaters which could end up reducing your energy bills. An undersized gas line can stress a tankless system and possibly reduce its lifespan all rinnai tankless water heaters are equipped with technology that safely ceases. If you re in a hurry mind checking out the start of this page. How to size a tankless water heater.

Simply locate the appropriate water heater sizes on ecomfort using your information. In this scenario a 200 000 btu water heater would be able to heat all of the water in a house at a 6 4 gpm flow rate to 110 f and at a 5 4 gpm flow rate all the flowing water would be heated to. I ve put my product recommendations there. The first factor in choosing a tankless water heater is calculating the size of your hot water heater.

Once you have your total flow rate and the required temperature rise you can find the right size tankless water heater for your home.