Honeywell HomeSmart Radiator Thermostat Valve/HR 27 ECO ETRV/Programmable Thermostatic Radiator Valve/Digital Intelligent Central Heating Controller/White / 2-Pack

It already saves me money by automatically turning off heating in rooms at certain times, reducing the bill by about 30%. Bring your wireless thermostat with you into the room you're in, otherwise none of these fancy TRVs will work properly.You can get the same effect by just using the cheapest old-style TRV and manually changing the temps every morning and night. Move the thermostat's location twice a day, again.Installation is easy, but do the following before installing it: check if the valve pin on your radiator is stuck, add WD40 and wiggle it up and down if so. Then, setup this device while it's not attached (it's more difficult otherwise). Change parameter 7 Stroke to 1 by following the docs I attached. Exit. Press menu, choose "set-temps", and there set the min/mid/max temps to e.g 14/20/30. Then, set the schedule of Mon-Sun, there you choose which of the 3 temps (14/20/30) to use and when. The 30C appears to be overkill, but let your thermostat deal with properly shutting down the boiler when a distant spot in the room reaches e.g 21C. Mount it, ensuring that it's screwed-in completely. I didn't need to use any of the adapters. With the temperature up/down buttons you can check if it properly closes the valve completely, by listening to the faint water-flow.

The supplied user instructions have obviously never been tested to see if people can follow them. By people, I mean that, say, twelve year olds should be able to follow them, not PhDs. However, once learned it will only take ten to fifteen minutes to set up each one.Here are some notes I made for myself.INTRODUCTIONThe thermostat turns the radiator on and off:1. For periods of the day2. When on, at one of three specified temperaturesIt is useful for rooms that are not needed when the heating for the rest of the property is on. For example, rooms that will not usually be used until the evening and can remain unheated until then.BUTTONS(this refers to HR27)It’s got five buttons, which I will refer to as:1. Menu (grid symbol) – offers options2. Select (O) to select and save changes to a parameter3. Up - increase parameter4. Down – lower it5. Mode (leaf) – set it to run automatically or manually, or take it off the radiatorINSTALLATIONThe basic installation is:1. Power up by opening battery cover and pulling off the yellow tab2. Set the language to English (This is parameter 1, option 2. The full list3. Set the time and date4. Adjust rotation - even if vertical it is useful as you will look at it from one side or the other.5. When it says MOUNT (or UNMOUNT) I assume it means it’s safe to fit it as the valve will be open and you won't press against it (not explained anywhere). I found removing the old thermostat and fitting the HR27 simple and easy.6. Press Mode to cycle the valve (no idea what this does, but listening to it grind away, it seems to adjust the physical connection onto the valve. Again, not explained anywhere)SET UPThe set up is:7. Program the time and temp schedule.a. Navigate to the Set Temps using Menu and Selectb. Keep the Mon to Sunday setting, or change it for more sophisticated scehdulesc. Adjust the High, Medium and Low temp settings (in 0.5 degree steps - eg 20.5)d. Navigate with the menu and select buttons to get to the Programsf. Then program the periods in sequence:i. Select takes you to the next periodii. Menu takes you back to the previous periodiii. Each period has a start and endiv. The following period has the same start as the previous endv. You can have four periods per dayvi. Select the temp, one of high, medium or low (each as previously set). The selection is helpfully illustrated by tiny 'sun, dot and moon' symbols (meaning high, med, low respectively).v. Save using SelectRUN8. Now use Mode to set it to automatic to run the program.Mode can also be used to set it to economy (a low setting), manual (high setting) or MOUNT / UNMOUNT to safely remove or put it back on the valve - quite useful if you want to program without doing Yoga.PARAMETER SETTINGSThere are 13 parameters such as language, rotation and most usefully, ROOM TEMP (as noted by another reviewer). Room temp means the device shows the actual air temp and not the current set point. It can be set by pressing Menu for five seconds, navigating to parameter 8, setting it to 1 (from 0) and saving it using Select. Parameter 12 can be used to calibrate the room temp (apparently, I didn't try it)The full list of parameters is on support.resideo.com - search for HR27 for this and other helpful downloads.I hope that when the batteries go flat I don't have to learn to program it again! But that's why I wrote these notes for myself. Or if I buy another, which I may very well do as it is fundamentally a good product - let down by poor documentation.

Device works well, but programming interface is very unintuitive, instructions supplied and on the web are very unhelpful

This is the most useless item that I have ever bought from Amazon. Neither the paper instructions supplied with the unit or the online version tell you how to set the thing up to switch the radiator on and off at the required time. Even Google doesn’t find any information about the unit.