This paper investigates, theoretically, a novel type of room temperature control for a wet domestic heating system based solely on the monitoring of system flow and return temperatures. The proposed controller would be sited at the boiler and include a user adjustment to set room temperature. Feedback from the house would be provided by the water returning from the radiators, eliminating the need for a conventional room thermostat. A theoretical derivation is provided, giving system flow temperature as a function of room temperature and instantaneous system differential, followed by some practical considerations for the proposed controller.
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