Buying Guide

Best Water Heaters for Your Home


Selecting the right point of use water heater is based on the following:

  • Use. How you plan on using water heater determines how much hot water it needs to supply, as well as whether you need a single unit, individual units at each point of use, or both.
  • Configuration. Most often used to augment a standard hot water system, but can also replace your central hot water heater with a series of point of use heaters.
  • Location. Capacity of the unit you need depends on the area where it will be installed and the availability of the power supply.
  • Tank or Tankless. Most rely on a tank to maintain a ready supply of hot water, but some point of use water heaters are tankless and only heat water as needed.
Flow Rates

Tankless point of use water heaters are rated by the number of gallons of water per minute (gpm) they provide. Refer to the table below to get an idea of the minimum gpm you require:

Average Flow Rates in Gallons per Minute (gpm)

Bathtub: 2.0 - 4.0

Shower: 1.5 - 3.0

Bathroom Faucet: 0.5

Kitchen Faucet: 1.0 - 1.5

Dishwasher: 1.0 - 3.0

Clothes Washer: 1.5 - 3.0

Temperature Rise

To calculate temperature rise subtract the temperature of the ground water from the temperature you want the water to be. The result is the temperature rise you require from your water heater.

Recirculating Pumps

Popular alternative to point of use water heaters that should be used with tank-style central water heaters.

  • Unused water in pipes is continually returned to central water heater
  • Pump placed under the sink at the fixture farthest from the main water heater is activated by a thermosensor and controlled by the user with a mechanical timer.
  • Pump mounted to the hot water outlet of the water heater pushes hot water into the system and is controlled by a non-powered thermostatic valve mounted under the sink farthest from the main water heater.
  • Relief Valve. Safety mechanism that releases water and pressure if the temperature or pressure in the tank gets too high.
  • Water Connections. Connections vary depending on the capacity of the tank. Check to make sure you have the proper connection hoses before installation.