Choice of thermostat advice please

[gmartine]

I was answering your query about a stat being able to monitor the outside temperature #23. It needn't be Tado but most smart systems connect to an outside weather service via the internet and adapt your heating in an anticpatory manner, that amongst some other features will save you something.

 

[diselsamm]

thank you gmartline. By the way I am very happy how well the key plug worked out. I can't recognise my own boiler now.

 

[gmartine]

Good to hear, when I get a chance I'll take a pic of my mother's boiler as I've noted the temperatures on the flow temp dial. From memory one oclock is about 60 deg C which hers is set to. Worth playing around with that of you haven't already, obviously it'll take longer for the room to get up to temp so allow for that if you experiment.

 

[diselsamm]

Now that you reminded me, I will dial it down as mine is set near to max atm. It's a long story but previously the boiler was not able to go over 68C and we had to keep the dial at near max. Basically the boiler was overheating and cutting out. This happened due to an extremely problematic conversation of the system to sealed one, resulting in circulation problems both in the pipework and in the main heat exchanger.

 

[gmartine]

Running the system at 80 or so degrees is far from ideal and will exacerbate the symptoms of your original enquiry. Never mind the return flow temp being excessive and above dew point or out of condensing mode it sounds like you have more fundamental issues than simply replacing the room stat will resolve.

 

[diselsamm]

Here is the long story. I inherited a system with a F&E tank, which was noisy. We converted the system to a sealed one. But it was not properly cleaned. In the mean time the HWC failed as well. My trusted heating engineer (not involved in any of this previously) cleaned the system chemically and flushed (both chemically and with a pump) the boiler heat exchanger as was very sludged due to previous owner neglect and following sealing of the system. We discovered that the boiler was overheating and was not going over 68C (locking out). The location of the magna clean filter was initially wrong and that was rectified. Currently the system is clean, the boiler finally dropped gas consumption, the plug you suggested had a further positive impact. It is nice and warm at home now. The system is properly balanced with temp clamps. The boiler is properly condensing. In fact the radiators are not hot to touch. Which is different to how they used to be, and still it is much warmer and nicer temperature wise at home.

 

[diselsamm]

I wanted to bring this one to conclusion. My cycling issue is completely eradicated. What solved it was: 1) plug key, kindly suggested by gmartline (thank you!) and 2) replacement of the wireless thermostat and receiver with a new (digital) one. I chose
Honeywell Home Single Zone Thermostat (Y87RF2024). The replacement was super easy and took less than 5 min.
I will make a new post asking for advise on how to decommission the wired programmer.