My wife and I are empty-nesters living in a detached 5-bedroom house, with traditional heating and indirect hot water (Potterton Profile 80e balanced flue gas boiler, hot water cylinder and cold water storage tank in the attic). It is a Y plan system using a 3-port motorised Honeywell diverter valve. There are 14 radiators, all of which have TRVs, mostly rather old Draytons. A pump is used to boost hot water pressure for the taps. We also have a separate hot and cold pump for our two bathroom showers. The boiler is old but fully functional.
Heating control is via a Honeywell CM907 Programmable Thermostat located in our downstairs hall. It is the only room thermostat in the house and allows us to select the required temperature at six times per day for each day of the week. A Honeywell ST6100 Timer controls the on/off times for the hot water. However, the Honeywell CM907 is obsolete and needs replacement due to a faulty LCD panel. Upgrading to a self-installed Evohome system is now under consideration, though I'm currently just starting to climb the learning curve.
Can an Evohome system be introduced in stages, swapping existing TRVs for HR92s one at a time? If so, what is the minimum working configuration?
The seating position in our main living room is some distance from a window under which the only radiator is installed. Instead of fitting an HR92, would it be better to use an HR91 and a separate wall-mounted thermostat closer to the sofas?
Heating control is via a Honeywell CM907 Programmable Thermostat located in our downstairs hall. It is the only room thermostat in the house and allows us to select the required temperature at six times per day for each day of the week. A Honeywell ST6100 Timer controls the on/off times for the hot water. However, the Honeywell CM907 is obsolete and needs replacement due to a faulty LCD panel. Upgrading to a self-installed Evohome system is now under consideration, though I'm currently just starting to climb the learning curve.
Can an Evohome system be introduced in stages, swapping existing TRVs for HR92s one at a time? If so, what is the minimum working configuration?
The seating position in our main living room is some distance from a window under which the only radiator is installed. Instead of fitting an HR92, would it be better to use an HR91 and a separate wall-mounted thermostat closer to the sofas?
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