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The room thermostat controls the heat in the room and stops it overheating. If a manual TRV, or any TRV not controlled by the room thermostat, is also in the room then it may turn off the radiator before the thermostat gets to temperature, in which case the thermostat never switches the boiler...

I need to remove the end cap of this radiator valve but for the life of me I can’t get it to budge, should the end cap unscrew or prise off? Thanks

It’s messy but not uncommon unfortunately.

What you are experiencing is exactly what I was saying in your other post. It’s a waste of energy to heat one room/radiator hence why I grouped together enough radiators TRV’s so that when the boiler fired it was worth it. I now believe it is better to allow a master thermostat to fire the...

The improvement would be having all the TRV's managed from a single app rather than multiple apps and access methods but, as I said, this comes at a £ cost which isn't going to be small. I don't like multiple thermostats having the ability to start the heat source potentially just for one room...

Replacing all your existing TRV’s with Wiser TRV’s will be an improvement on what you have now but at a cost. I’m not a fan of micro zoning and have replaced most of my Wiser TRV’s with manual TRV’s to act as temperature limiters. I think you have two distinct areas heated from a single heat...

Fortunately I use Home Assistant to manage the heating so not much use for the app. HA really shows the app for what it is, I.e not great.

They do their job well, you just need to find a suitable spot.

It is ridiculous how expensive the Wiser smart plugs are (even though they arent just smart plugs) but its a closed zigbee sysem so we have no choice. Have you had the recent Wiser Home app v7 update yet? Its very different to the previous versions, I'm undecided about the new home screen.

The Wiser TRV’s and room thermostats do not act as zigbee relays, you need a mains powered device to act as a relay (Wiser smart plug or electrical heat switch for example). The Wiser zigbee network can not be combined with another zigbee network.

Mines a fully pumped system installed in 1996. It originally had a heat only boiler but we now have a system boiler installed in 2015. The main pipework is 28mm and the pipework to the radiators is 15mm, i dont know what happens to the pipework under the floor.

My boiler flow and return pipework is 28mm so not unusual.

You must have two motorised valves, the wiring looks like an s plan.

Its a Honeywell valve body, same as mine.

If your friend replaces the Vaillant controls with Hive it will be a big downgrade. Have a look at what Hive can do, it’s not much other than turn the boiler and on and off.

Are you planning on keeping the existing boiler controls and just installing “smart” TRV’s to act like standard TRV’s?

As I understand it from online posts it can be a right pain in the a*** to get DHWP to work with Viessman boilers due to the demand box requirement. There is a good thread on the Buildhub forum.

How well insulated are your rooms? Heating individual rooms can make the heating less efficient as the cost to heat one room is not necessarily cheaper than heating multiple rooms. Unless the unheated rooms are very well insulated they will just suck the warmth from the heated rooms resulting in...

The diverter valve I can understand, I thought the OP was talking about a motorised valve as in a Y plan system.