Honeywell Home MT1 Mechanical Environment Thermostat

Good Quality and make- very well known- value for money- works perfectly- easy installation paperwork provided- just take the pictures before removing old ones- wiring is very easy- sets temperature is accurate.

I chose this device to replace a failed vintage analogue unit. Its simple to operate, does not have confusing or unnecessary features or timers to set. As others have pointed out, its a bit smaller than the previous device and a small amount of patching plaster was needed. Its a two wire install, a simple 'dry contact' switch - if you have an older 3 wire install it can still be used. There's little programming to be done, no clocks, timers etc. Just set the temperature you want. There are two presets that you can use and modify, to quickly set a day and night temperature at the push of a button. Tale a moment to read the instructions and set the DIP switches inside. I'd suggest a 20 minute cycle, and conventional - I found the factory set 'proportional adaptive' setting an issue, it kept turning on and off too frequently, since the boiler has some of its own flow and temperature adaptions, and they seemed to be in constant argument. This may be the issue others have hinted on saying its 'clicking on and off a lot'. Further, the pump cycle option is pretty pointless if you also have a central heating timer elsewhere as most have - it cant exercise the pump if the timer is off, and most of us turn this to off during the summer months. Overall its a tidy and simple unit and does the job without fuss. The hysteresis - the amount it overshoots and undershoots the preset temperature to stop it hunting seems to be about 0.5 degrees and not adjustable - (some you can change) but unless your house is terribly insulated or your windows are open this wont be an issue.

A simple yet effective thermostat. Simple to install and does the job perfectly.

Nice replacement for my old room 'stat which had failed. I decided to go for Honeywell as it was a direct replacement for the ancient original. This fitted perfectly and has a nice rounded look and solid feel. Almost £10 cheaper than local supplier and same day - free delivery - great service.

Replaced my manual dial with this ! It’s great value ! Easy to install!

Not sure it’s good practice to send out, new but previously opened and resealed items. Not tested the thermostat as yet.

This should have been the perfect thermostat, trusted company, but was not suitable for our system.

Very easy to install if you know how to (obviously). Read up on this and other models. I even went into copilot and to show/tell me how to wire the unit. First things first. When i took off my old Honeywell thermostat it was simply screwed into wall via raw plugs. You have to have a wall back plate for this. So i bought one via amazon. Grinded out a hole (the unit is quite small, so i had to make good with filler. But it does line up with a standard size back plate - best to get a deep one). And i must say, it worked spot on. Here's the following that worked for me. Behind my old Honeywell thermostat i found 4 wires. Red, Blue, Yellow, and Yellow/Green. Now i Know Yelloe/Green is Earth. I know Red is Live. I know Blue is Neutral and I know Yellow is a Conductor or Command called a Switch Wire. This last cable is the most important to know as it tells the boiler to turn on and off. So if you do not have my colour wires find out what you have - ask copilot or read somewhere. With the info, make safe your power supply toand from the boiler (i just turned the whole switchboard off) Get your old wires ready - you ONLY need two. They are Live (red or maybe Brown) and the Command/Conductor wire (Yellow or what ever yours is). Cap off and make safe any thing else ie neutral and earth. I found using lightweight/smaller additionals were the best way forward to input into the rear of the new themostat as they are very small access hole with small screws to tighten. I then put these two wires into a small block connector each, then fixed the wires for the boiler to them. Tuck everything in the back plate. Add two batteries (not supplied in the rear of the device) this is for the fuctionanability of the device (it does NOT use 240v from main to do this part). Offer the rear of the thermostat to the wall back plate, fix in with standard screws. Put front cover on carefully. Screw in from bottom as provided. And get going. The batteries have now allowed you to controll the on/off. Clock Control and the programmer function. Now wait a day, sand the filler and paint - job done.

excellent

Es muy sencillo, muy facil de manejar, facil de instalar y funciona a la perfeccion.

Thermostat très facile à installer

Fonctionne bien ! Mais très limité dans les réglages possible !

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