LOWENERGIE Electronic TRV Thermostat Valve Head (2, 28mm to 30mm Adapter)

Excellent for the price
This was to replace a broken Terrier i-temp thermostat to which I will compare.Bad points first – manual is OK, not the best.No mention of the initial motor travel calibration. I found the best way is to install batteries, fit the thermostat to the radiator being careful not to touch any buttons. The display will show ADAP 0. Press the UP button, and the thermostat motor should whirr into life, eventually hitting one limit. It will then reverse direction and ADAP1 should be displayed. When it hits the other limit it will stop and will be ready for programming.Incidentally, some reviewers mention how noisy the unit is – mine is virtually silent.Programming is slow (once you’ve worked it out) as you have to set the on/off times for every single day. This might be considered a bonus as you can set different on/off times for each day if you want!The thermostat does not ask for a date, so it will not automatically change the clock for daylight saving – you will have to change the clock manually.You can only configure 2 temperatures, essentially an “On” temperature (called Comfort) and an “Off” temperature (called economy) which is fine for me but may be unsuitable for other users.Good points – very good build quality – seems very solid and smaller then the i-temp. LCD is clear and backlit.Buttons have a nice positive feel.Most importantly, the thermostat does seem to work very well once set up, switching the radiator off when programmed to do so and controlling to the set temperature. You do have to set the temperature slightly higher than you want, as with all radiator thermostats, it will measure the heat coming from the radiator more than the room ambient.Its good to see it display the actual measured temperature on the LCD and whether the output is on or off, something that the i-temp did not.Overall, for the price, it is an excellent purchase and I am very happy with this thermostat. Delivery was quick too arriving next day.

Once you get past initialisation and calibration it works pretty well
I almost sent this back because it did not appear to work at all. I spent ages programming the times – but once attached, nothing happened – the radiators did not come on when expected.It comes with a small instructions leaflet -which explains pretty well how to programme the times etc – but there is absolutely no mention of how to calibrate/initialise it.I tried emailing the seller a few times – but the only thing they could suggest was to return it for a refund and order another one – like that was going to help calibrate it.The solution – for me at least – remove the batteries, attach the valve to the radiator and then insert the batteries. When Adap 0 / Adap 1 is displayed on the screen, press the up / down buttons – this should sort out the calibration. You should hear the motor whirring up and down a few times and then it should all work.One other positive, is it seems to have some memory, so you can remove the battery’s and it will retain any programming – not sure how long it will hold the programming – was ok for at least 10 mins for me.

It doesnt fit.
The thread sizes are correct, but it seems that all the actual valve parts of the TRVs are subtly different, depending on the manufacturer. So this item was not quite tall enough – would not screw down onto the valve properly.Also, seperately, I found that the actual valve on the radiator was jammed – so needs replacing anyway. Definitely worth checking BEFORE you progress.So, nice idea, but did not work for me.