Heating system and control

4 Posts

Hi all, I recently purchased a new house and just trying to sort everything out as you do, I was hoping someone on here could help out as the heating control is well, outdated to say the least, i have added a picture so you all can see, I've tried searching for this control unit but haven't found anything close, im wanting to change this for obvious reasons to something a bit more modern and most likely efficient too, preferably digital (previously used to the old honeywell digital with the sliders) and have the ability to turn the water and heating on separately, the house oddly enough has a gen 1 smart meter so I been told, this is for both the mains gas (boiler) and electricity.
The thermostat in front room again is old but I dont actually think it works so needs replacing, found a modern equivalent but they dont have a L and the Neutral is from what i found just cut back out the way, but was wondering where the Live would go to as new ones are iirc numbered 1 to 6, picture to show inside what I have.
So if anyone can help I'd be greatly appreciated or would this be better to get a plumber/electrician to have a look at the setup
Thank you

The thermostat in front room again is old but I dont actually think it works so needs replacing, found a modern equivalent but they dont have a L and the Neutral is from what i found just cut back out the way, but was wondering where the Live would go to as new ones are iirc numbered 1 to 6, picture to show inside what I have.
So if anyone can help I'd be greatly appreciated or would this be better to get a plumber/electrician to have a look at the setup
Thank you


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I'd suggest that it cant differentiate between hot water and hot water with heating with only one connection. To do that it would need another connection one to fire the boiler and another to enable the pump via the thermostat. You might find that the boiler just runs continuously under the control of it's internal thermostat ( a lot of old four pipe systems operated that way) and the time switch just enable the pump to come on when the room stat calls for heat
You need to check out how the system operates - is it a four pipe gravity fed system or is it a two pipe with motorised valves. Is there a thermostat on the hot water tank. What make and model is the boiler. Have you got a wiring junction box near the boiler. Does the "programmer" enable the boiler or does it just enable the pump.
You might be better off getting something like a wireless programmable stat and giving up on the external wiring but it will depend on how your system plumbing is configured
The boiler will only turn on via the horstmann unit.
Pump is directly under the boiler but from what it looks like is a 2 pipe system, there is 2 tanks in the loft, small one for central heating and larger for hot water, most of the piping seems to be new, and an new emersion heater, I have looked but cant find any therstatic control valves so assuming its boiler controlled, its a bit of a frankenstein mix of old and new which is why I'm scratching my head at it.
Radiators need replacing which is no problem for me and ill be putting some trv valves on
I'll get some pictures and hopefully can be pointed in right direction
Thank you
Treasure the moments that you have. Savour them for as long as you can for they will never come back again.
It's a 3 port valve and enables you to switch the boiler output to either hot water, heating or both (Y plan)? Or you could have an S plan system which uses two 2 port valves to do the same thing.
Treasure the moments that you have. Savour them for as long as you can for they will never come back again.
Thank you all 👍