What is a Dual Purpose Water Heater A Dual Purpose Water Heater is a unit that will provide both heating water for space heating and also potable domestic hot water for washing from a single unit without any additional controls required Domestic hot water is given priority over the space heating, and is activated by flow through the domestic hot water system DHW is on demand and continuous, it will be provided as long as the faucet is open Once DHW call is completed the unit will revert to heating the house as required
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