Depends what your climate is like. The most efficient system is a solar collector hooked to storage tank with NO pump - just a thermo-siphon system. But that only works well in climates warm enough to have a storage tank next to the collector.
In cold areas, a collector on the roof using a closed loop of anti-freeze protected liquid gets hooked to a storage tank in a heated building. For this a circulation pump is needed. Often a small solar panel is used to run the circulation pump. Since no heating occurs unless the sun is shining, it makes a nice system.
There is also a drain-back system for cold areas that does not use a closed loop. It directly heats the domestic water. A bit more complicated, but the solar collector drains itself when it's cold to prevent freeze up. Even if you just stick an 80 gallon preheat tank in your home with no solar or wood coils, and hook it before the main fuel-fired (or electric fired) heater - it will make a difference, especially if you use deep-well water. My water is 48 degrees F when it comes out of the ground. It lets the water reach room temps before going into the main heater. Whatever you do, remember that . . . if you send hot water into a propane tank heater, you can damage it - you must use a tempering valve. Also, if you send preheated water into a tankless, you gain nothing and it heats the already hot water, over again. That is, unless you special order a thermostat controlled tankless - usually marketed as a "solar tankless."
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Today's Featured Article - Sunday Drives - by Cowboy. Summer was finally upon us here in Northern Maine. We have two types of industry up here, one being "Forestry" (Wood Products) and the other "Farming" (Potatoes). There is no shortage of farm tractors and equipment around here! I have been restoring old Farm Tractors for the past 6 years, and have found it easier and less expensive to hit all the auctions and purchase whole tractors for parts needed. My wife who works at a local school, and only has weekends and summers off, while on t
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