0 Helpful?

To keep basement warm - keep away from heat pump water heater?

We are building an energy efficient home (ACH 0.8 or better at 50 pascals) and I want to avoid a water heater heat pump because I want to put my shop in the basement and I don't want to lower the temperature in the basement. Am I thinking about this issue correctly considering the energy these heat pump water heaters save? We plan on a net zero energy home using solar. stuartkrantz@gmail.com/954-732-3347

Asked by Stuart Krantz
Posted Jun 12, 2014 8:26 PM ET

Tags:

2 Answers

Select your preferred way to display the comments and click "Save settings" to activate your changes.
1.

Stuart,
You are correct that a heat-pump water heater will lower the temperature of your basement. If you don't like that feature of heat-pump water heaters, you should choose a different type of water heater. For more information on this issue, see Heat-Pump Water Heaters in Cold Climates.

Answered by Martin Holladay, GBA Advisor
Posted Jun 13, 2014 7:17 AM ET

2.

The amount of temperature reduction is a function of how much hot water you use, and the total thermal mass inside the insulation in the basement, and the amount of heat source in the basement (active heating, or warm mammals + lighting, solar gain, etc.). In a typical home the net average temp reduction is less than 2F, but in a net zero energy home it could either less, or more, depending on the particulars.

A heat pump water heater also behaves as a dehumidifier, and will lower the amount of mechanical dehumidification &/or ventilation required to keep the indoor air humidity within healthy levels for both occupants & building.

Answered by Dana Dorsett
Posted Jun 13, 2014 11:00 AM ET

Other Questions in Mechanicals

Air space required for ge geospring hybrid electric heat pump water heater?

In General questions | Asked by Stephen Audretch | Jul 24, 16

Looking for design software recommendations

In General questions | Asked by Nickolas Van Kleeck | Jul 23, 16

Unvented cathedral ceiling — insulating from above

In General questions | Asked by Paul Buchkowski | Jun 25, 16

Preferred underlayment under metal on unvented roof?

In General questions | Asked by Robert McKee | Jul 23, 16

We are building a 700-sq.-ft. cottage on southern Vancouver Island, Zone 4 Marine

In Green building techniques | Asked by Sandra Garraway | Jul 22, 16
Register for a free account and join the conversation


Get a free account and join the conversation!
Become a GBA PRO!