Has anyone had any success in preventing their boiler from short cycling?

dirtychinchilla · 6 Jan 2025 at 11:22

dlockers said:
Sorry I missed it is a Vaillant. Can you post a pic of your wiring center? If you have the proper vaillant one, you are best off with a Vaillant controller as it supports a proprietary version of OpenTherm.

squerble said:
The wiring centre is probably just the usual chock block with everything unlabelled

I think it is. Either way, I'm not going to install OpenTherm

dirtychinchilla · 6 Jan 2025 at 11:29

dlockers said:
Like I said if you fit the actual Vaillant controller you get their version of OpenTherm. The Honeywell you linked is still just going to be an on/off stat and will need replacing later if you really care.

Oh sorry, yeah. Honestly, I can't be bothered. It's still pretty expensive - around £225

dirtychinchilla · 6 Jan 2025 at 11:37

dlockers said:
If you are budget sensitive on this just extend the wires on your existing stat. No point replacing something crap for something equally as crap

I can stretch to £75

I don't think UK heating systems are good full stop. I don't necessarily think the smart ones are much better

dirtychinchilla · 6 Jan 2025 at 13:08

dlockers said:
Well they suck ass when you fit a dumb thermostat. With a proper weather compensation thermostat they work great.

That's true, but it also makes no sense that one radiator in a zone, which could be your whole house, dictates whether the rest of the building gets heat.

Your smart thermostats are only good for comfort - weather comp is good for efficiency as well. And how about return temps?

dirtychinchilla · 6 Jan 2025 at 13:31

dlockers said:
The Vaillant one I am suggesting isn't even "smart" in the sense I think you may be assuming. It is just the proper thermostat for that boiler.

I am speaking from experience here btw. I had a 7.5k refurb (new Vaillant EcoTec 624) and opted for Hive as I had the TRVs and knew no better. I did extensive research and realised I would have been significantly better off with the Vaillant controller with weather comp. I was too far down the road though and lacked the proper wiring center. And I wanted smart features which are an additional gateway module.

Oh no, it's not smart at all.

I know having weather comp would be great, but I normally have the flow temp set around 50-55C anyway, so I'm not sure it would make a great deal of difference to consumption.

The issue I have with all these things are that the upfront cost is high, but gas is very cheap, so the ROI would be long.

dirtychinchilla · 6 Jan 2025 at 13:34

dlockers said:
Fair -- I think your 75£ idea is neither here nor there though. At least top up 50 and get Hive/Tado and get the smart/program the timer from your phone or do nothing and extend the wire.

I have two zones to look after, so it's not £125 sadly