I installed a new Viessmann Vitodens 050 W in 2025. It heats a hot water tank, which then supplies heat to the underfloor system, as well as providing domestic hot water to the house. The circulation pump is permanently running in order to keep the tank up to the required temperature. If a thermostatic sensor were placed in the tank and connected to the boiler, there would be no reason to keep the pump running, thus saving up to 300 kWhr per year. Please advise if this modification is possible
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