- Joined
- 27 Jan 2008
- Messages
- 23,773
- Reaction score
- 2,683
- Location
- Llanfair Caereinion, Nr Welshpool
- Country
This is pure interest, no intention of zoning my central heating, but was told today central heating must be split into zones, which I assume means motorised valves?
So without zones my understanding is every radiator has an electronic TRV head which tells the central thermostat how much heat is required, and in turn the central thermostat tells the boiler what output is required. So we have systems like EvoHome which using OpenTherm do this.
However with zone valves it would need each TRV head to tell a Thermostat which in turn told the zone valve how far to open and then the zone valves would tell a master thermostat how much they were open and then that would tell the boiler, however I know of no such system.
I have not even seen a motorised valve which can regulate how much fluid passes through it.
And to be frank can't see any good reason for fitting zone valves where programmable TRV heads are fitted.
I can see how it would be cheaper maybe to split the house into zones than to fit all programmable TRV heads, but can't see how this would work with a modulating boiler? Unless that is no wall thermostats are used and the boiler uses the return water temperature to control the amount of modulation, then we have age old problem how do you tell the boiler not to come on as it's a warm day.
So what is the crack on this splitting into zones?
So without zones my understanding is every radiator has an electronic TRV head which tells the central thermostat how much heat is required, and in turn the central thermostat tells the boiler what output is required. So we have systems like EvoHome which using OpenTherm do this.
However with zone valves it would need each TRV head to tell a Thermostat which in turn told the zone valve how far to open and then the zone valves would tell a master thermostat how much they were open and then that would tell the boiler, however I know of no such system.
I have not even seen a motorised valve which can regulate how much fluid passes through it.
And to be frank can't see any good reason for fitting zone valves where programmable TRV heads are fitted.
I can see how it would be cheaper maybe to split the house into zones than to fit all programmable TRV heads, but can't see how this would work with a modulating boiler? Unless that is no wall thermostats are used and the boiler uses the return water temperature to control the amount of modulation, then we have age old problem how do you tell the boiler not to come on as it's a warm day.
So what is the crack on this splitting into zones?