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A long time since I started this thread but I have finally bought and installed a Honeywell T4R wireless thermostat to replace the EPH CP4. Early days, but so far so good. I am back to 6 cycles / hour recommended for gas boilers and I have set the minimum run time to 2 minutes. The system...

Let us know how you get on with it. Good idea just to order the room stat and then add to it. My reservation about having something with app control is that neither my wife nor I are spring chickens any more and, although we are reasonably tech savvy, we need a system that is straightforward in use.

I'm sure that you are right. Out of interest, and a fair amount of frustration, I put the EPH in to 'normal' mode this evening. Gas consumption has rocketed which was not a surprise and, like you, I have ended up heating the whole house despite the TRVs being wound right down. I'll take a good...

Thank you. I do like the idea of being able to control the temperature in each room separately - it makes sense but to install the Drayton Wiser would cost me around £500. (And that's assuming that I can do it all myself.) Would I get the return? Don't know is the short answer. I have read...

I can see a lot of threads about wireless room thermostats but as many of them are some years old I would appreciate some recommendations please. I have a Worcester Bosch Greenstar 24Ri boiler and am currently using an EPH CP4 wireless thermostat. I am not very impressed with this! I prefer to...

The plastic becomes brittle with age and eventually breaks. I have only had a couple of these fail in over 20 years. Repalcement heads are around £18 ea from Screwfix. Check that the pin on the valve body is moving freely before you fit the new head.

I think that is exactly what is happening! It seems to stabilise at 0.4C below set point when the burn time will be longer of course. Maybe! I am currently experimenting with the CP4 set at 2 cycles per hour and, at the moment, it seems to be behaving. I am going to ask the heating installer...

No, tried that. Because boiler runs flat out there is a big overshoot on set point and consequently requires a big fall in room temperature before system starts again. Uncomfortable! Few moving parts on an old boiler. Might be worth trying again. No, I didn't. Display kept failing on the...

The old boiler was a traditional on / off, full flame or nothing! The Honeywell CM927 did short cycle as it approached set point and as the room temperature started to fall but at least the heat input was significant. From memory there was a minimum on time setting. Control was spot on!

All my initial observations were done with 3CPH and prop band at 1.5C. On time with a temperature drop of 0.1C is approx 1 minute, consistent with the calculated time. Yes, the boiler fires immediately. The boiler is a variable flame unit and never starts on full flame. This is normal. Yes...

I have an EPH CP4 wireless thermostat controlling a Greenstar 24Ri gas condensing boiler. The CP4 was a replacement for my old Honeywell CM927. I use the CP4 in TPI mode. (If I run it in ‘normal’ mode I get a huge overshoot on set point temperature.) The default settings are 6 cycles per hour...