Solar hot water systems in hard freeze areas need a little more engineering to avoid a freeze - up, but this is not terribly difficult. (dotearth.blogs.nytimes.com)
We produce the very best, absolutely most expensive solar hot water systems available here. (realclimate.org)
Solar domestic hot water - Nearly 100 % on site electric generation - blown in Cellulose & Air Sealing in the attic after extensive energy audit - Gas back up Solar hot water system with dehumidification loop - Window - quilt insulating window treatments The house is a fairly standard colonial that happened to have a great south facing roof in the back. (energysage.com)