Nov 06, 2020 · Renewable electricity (be it solar, wind or water) can be used to run an efficient electric boiler for such a system. 5. Wood-Fired/ Biomass Heating. Piped hot water to heat a greenhouse can, as mentioned, be warmed by the sun, or by decomposing materials. But if these don't bring the water to the required temperatures, then a boiler can be used.
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