Sussel News

Heat Pump Water Heaters in Cold Climates: Pros and Cons

Author name: 
Alex Wilson
Blog Category: 
Energy Solutions
GreenSpec Insights

While a heat-pump water heater will save significant energy on a year-round basis, be aware that in a cold climate the net performance (water heating plus space heating) will drop in the winter.

Electricity consumption by our GeoSpring heat pump water heater in February. Note the spike mid-month when I switched the mode to "boost." Click to enlarge.
Photo Credit: here

We chose a heat pump water heater for our new house, and as I've recently discussed here, there are a lot of reasons why you might be doing the same.

Using an air-source heat pump, heat pump water heaters (HPWHs) extract heat out of the air where they are located to heat the water.

That means that a HPWH cools the space where it is located. That’s a good thing in the summer—it doubles as air conditioning—but in the winter it’s not so helpful. That’s especially the case in a cold climate in a house without a standard heating system.

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Picking a Water Heater: Solar vs. Electric or Gas Is Just the Beginning

Author name: 
Alex Wilson
Blog Category: 
Energy Solutions
GreenSpec Insights

Why we opted for electric water heating over a solar water heater

Our GeoSpring heat-pump water heater. Click to enlarge.
Photo Credit: Alex Wilson

As we build more energy-efficient houses, particularly when we go to extremes with insulation and air tightness, as with Passive House projects, water heating becomes a larger and larger share of overall energy consumption (see Solar Thermal Hot Water, Heating, and Cooling). In fact, with some of these ultra-efficient homes, annual energy use for water heating now exceeds that for space heating—even in cold climates.

So, it makes increasing sense to focus a lot of attention on water heating. What are the options, and what makes the most sense when we’re trying to create a highly energy-efficient house?

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