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Posted by HeatPro on August 01, 2008 at 22:49:06:
In Reply to: How about electric boilers posted by David Fisher on August 01, 2008 at 21:26:38:
Natural gas is a good buy if you can get it. Electric boilers are available when you have decent rates; they're a lot like water heater elements in a small heater with additional controls for circulation. There are heat pump units that can transfer heat to the system as well, so you can use the electric boiler as the backup heat.
http://www.daviddarling.info/encyclopedia/A/AE_air-to-water_heat_pump.html
http://www.heatharvester.com/air-source-intro.htm
http://www.directindustry.com/prod/ciat/air-to-water-heat-pump-8605-354364.html