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 StuartKrantz
Posted Jun 12, 2014 7:26 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 user-756436
Posted Jun 13, 2014 6:17 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 user-1004076
Posted Jun 13, 2014 10:00 AM ET

Other Questions in Mechanicals

SIP roof issues

In General questions | Asked by Matt Melton | Feb 17, 17

Basic HRV concepts/design

In Mechanicals | Asked by Rebecca Borton | Feb 25, 17

Integrating Ducted Mini-Split with HRV

In Mechanicals | Asked by John Brown | Feb 25, 17

Homemade walk-in cooler

In General questions | Asked by Matthew Ervin | Feb 25, 17

Living proof you can be energy efficient in a cost effective way

In General questions | Asked by Jay Hersh | Feb 25, 17
Register for a free account and join the conversation


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