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Standard practice in the renewables sector to use unvented stores with multiple heat sources.
:: AKVA SOLAR - see about 3/4 of the way down using solar and biomass.
99.9% of the thermal stores we install are unvented, and the G3 regs don't apply to thermal stores....
PROPERLY designed with correctly sized thermal stores and properly sized heat supplies (back up boiler if primary heat source is a back boiler wood burning stove..) you'll never have the fight over heating or hot water, thanks to stratification, baffling, flow and return positioning and the correct use of direct and indirect approaches, sometimes with external plate heat exchangers. That way you never have a shortage of hot water or heat. It's also why we never (and you shouldn't) simply walk in to pb or pc and buy an x00 litre thermal store.
You don't need hot water tank at all this way..
:: AKVA SOLAR - see about 3/4 of the way down using solar and biomass.
99.9% of the thermal stores we install are unvented, and the G3 regs don't apply to thermal stores....
PROPERLY designed with correctly sized thermal stores and properly sized heat supplies (back up boiler if primary heat source is a back boiler wood burning stove..) you'll never have the fight over heating or hot water, thanks to stratification, baffling, flow and return positioning and the correct use of direct and indirect approaches, sometimes with external plate heat exchangers. That way you never have a shortage of hot water or heat. It's also why we never (and you shouldn't) simply walk in to pb or pc and buy an x00 litre thermal store.
You don't need hot water tank at all this way..