Where Is Solar Heating Headed in Canada?

Will solar heating replace gas furnaces?

Not on its own. Winter sun is weakest when heat is needed most, so any plan to cover a whole season depends on storage, and storage costs money. Most policy attention and consumer spending are going toward electrifying heat with heat pumps, which work with a simple outdoor unit and an ordinary grid connection. That gives them a head start that solar thermal is unlikely to match in single-family houses.

The honest forecast, then, is that solar thermal will find its place in specific roles instead of becoming the default. No reliable numbers exist for how large those roles will be, and anyone quoting precise future market shares should be asked for the source.

A look at what the existing records tell us is sobering as well as encouraging. The few large solar space heating projects that ran for years achieved high solar shares, yet several shut down once components aged or ownership became unclear. Technology was rarely the only obstacle.

Where does solar thermal still make sense?

Three places stand out. The first is domestic hot water, where demand is steady all year; see how solar water heaters work. The second is ventilation air preheating for larger buildings, where simple collectors can offset heating on sunny winter days, as in solar air heating in Canada. The third is pool heating, which extends a short outdoor season cheaply, covered in solar pool heating in Canada. In each, the load matches the sun well enough that no big store is required.

Costs will vary by region and year, so quotes decide in the end. One practical test is the heat load profile: a steady all-year demand favours solar thermal, while a demand that spikes in January favours something else.

What happens to PV and heat pumps together?

Photovoltaic costs have fallen far enough that rooftop panels powering a heat pump are a strong rival to a thermal system for many owners. The pairing is flexible, since the same panels run lights and appliances. The comparison is made plainly in solar thermal vs solar PV. Where thermal wins is cost per unit of heat delivered, at a scale and with a heat demand that suit it.

Heat pumps and solar do not compete in every case. A house with a heat pump and rooftop panels can use the panels to offset the pump's winter electricity in part, and a house with a solar hot-water system can use a heat pump for the rest.

Is there a future for neighbourhood-scale solar heat?

Possibly, in new, dense developments where a shared system can be designed before the streets are laid. Drake Landing Solar Community proved the technical idea in Okotoks, Alberta: 800 collectors, 144 boreholes and a district loop delivered 97 percent solar space heating by 2012 and 100 percent in 2015-16 to 52 homes, as set out in the performance results. It also showed the weak points. Performance slipped from about 2020 through maintenance problems, and decommissioning began in 2024.

A newer project would have to answer questions of ownership, upkeep and cost. Those are examined in could a Drake Landing style system be built today and lessons from Drake Landing Solar Community.

There is also the question of who runs it. Shared heat needs an operator with a long time horizon, such as a utility, a municipality or a co-operative, and a funding model that survives changes in leadership and in fuel prices.

What should a reader watch for?

Watch the cost of storage, the progress of cold-climate heat pumps, grid emissions in your province, and whether local governments back shared heating in new subdivisions. Any one of these could shift the picture. Current options and terms are best checked with provincial energy ministries and utilities, and the wider menu is in renewable heating options in Canada.

For readers who want the original project's story, the about page sets out how Drake Landing came together and what became of it.

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