Quote:
Originally Posted by macafee2
with a two pipe system ( flow and return) and thermostatic radiator valves, if the flow and return are similar temperatures then the thermostats may have closed as they are up to temperature and no hot water from the boiler is flowing through them.
macafee2
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That's correct, the system relies on the thermostatic valves on the rads to regulate themselves with the exception of the downstairs toilet which doesn't have a thermostatic valve on for flow reasons. The house is well insulated and the log burner keeps the temps at a nice cosy level, the boiler has very little work to do as the rad valves do the job of telling it when to fire up, there is no room thermostat fitted as the house regulates itself from room to room and the boiler thermostat does a grand job of keeping the whole house toasty, the system also has high efficiency radiators fitted that give out more heat for the same flow. it wasn't always that way though and the house used to be a very cold one.