Case Study: How Miller's Dairy in Creemore, ON Heats 3,500+ Litres of Water a Day with Solar

Heat-pipe evacuated-tube collectors are Enerworks' commercial platform. Each tube contains a sealed heat-pipe that transfers heat efficiently from the absorber to the header manifold. The technology is standard glazed solar thermal — a glycol loop in the outer piping, a heat exchanger inside the storage tank, potable water on the inner loop. Heat-pipe collectors typically outperform flat-plate collectors in Canadian winter conditions because each tube is thermally isolated by vacuum, cutting heat loss to ambient.

Three things about dairy sanitation hot water make it near-ideal for solar thermal:

1. The load is CONSTANT. Cows produce milk every day; sanitation happens twice a day. There's no seasonal drop-off like a summer camp or a school. Solar collectors are earning their keep every day of the year, not just July-through-September.
2. The load is LARGE. 3,500 L/day at 60°C requires substantial energy input. A residential single-family DHW load is 150–300 L/day. Miller's is 12–23× that. Payback tracks volume — the more you use, the faster it pays.
3. The load is EXPENSIVE to heat. Dairy plants historically use natural-gas boilers to generate hot water. Displacing gas at commercial rates ($0.35-$0.55 per m³) with solar-thermal capital delivers steady operating savings.

For a dairy processing plant running 3,000-5,000 L/day of hot water demand, an 18-24 collector system in 2026 would run approximately:

Provincial rebates stack where available: Ontario has no direct solar-thermal grant currently. Quebec offers eco-Performance / Rénoclimat for some qualifying commercial installs. BC's PST exemption + Efficiency-related farm programs can lower BC net cost meaningfully. The federal 30% Clean Tech ITC applies to CRA Class 43.1 eligible property — most active solar heating equipment qualifies. Confirm eligibility with your accountant.

1. Sanitation hot water is under-marketed as a solar target. Most dairy owners assume solar means PV; the reality is that hot-water displacement typically pays back faster on a dairy operation.
2. Heat-pipe evacuated-tube collectors outperform flat-plate for cold-climate commercial applications. The vacuum insulation matters in an Ontario January.
3. Enerworks is a legitimate Canadian manufacturer with a demonstrated commercial installer network. For dairy-scale installs, going with a Canadian OEM's certified installer network materially reduces integration risk vs a general solar shop.
4. Payback timing depends on the backup fuel being displaced. Natural gas displacement runs longer payback than electric-resistance displacement. Propane displacement is the fastest — if you're a rural dairy on propane, run the numbers.
5. Federal 30% Clean Tech ITC is the single most important line on the incentive stack for a commercial retrofit like this. Confirming Class 43.1 eligibility BEFORE signing avoids expensive re-engineering later.