Honeywell Home MT1 Mechanical Environment Thermostat

I bought this stat to replace my existing analogue version. It's a very smart looking unit and does a lot for the money and is easy to operate.Fitting the unit was quite fiddly especially as the fixing holes are totally different from a standard stat. Also the cable entries are very small meaning I had to put the cable excess into the wall void by channeling out some of the plaster.It's very well made and I did like the fact it has a finger guard over the live wires for when you need to replace the batteries. The display is very clear and seems to be accurate at temperature reading, general operation is easy but the instructions are useless, there is a certain amount of self learning with this device as it calculates how long it takes to get the room to the desired temperature.There are modes for holiday, eco and comfort and an option to run the pump once every 24hrs for a minute to prevent pump seizing a very handy feature along with a built in frost stat setting.Very pleased with it overall but only been using it for a couple of weeks and the learning feature is now perfect it is so cosy in the house.I have had people ask about getting it to work there are some DIP switches in the back of the unit these need to be set to get it to work correctly, if you find it won't call the boiler to run change switch 3 to a different position.

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.

Works great, easy to install and worth every peny

We purchased 6 of these to replace old yellowed originals. They were so easy and quick to install, they look great and have simple controls. What’s not to like?

This review is for the Honeywell HomeMT1 Thermostat (THR830T)It works Perfectly! BUT... only when correctly wired. The Honeywell wiring instructions on the leaflet are incorrect! The wiring as illustrated below and as shown in photo are per my certified electrician.My Honeywell T1 Mechanical thermostat to control for my ceiling mounted Infrared panel heater is connected to the circuut controlled directly to my Eddi Solar Diverter which is connected to the Electrical Distribution Board.Check compatibility of your chosen thermostat. Eg The Eddi Solar Diverter is ONLY compatible with mechanical thermostats NOT digital.PLEASE NOTE the installatiin wiring instructions are NOT correct for all configurations. Consult an electrician if in doubt or if the Honeywell instructions don't work).The wire connection terminals are along the top of the thermostat with each terminal having a corresponding number 1-4 + terminal for earth (NB if you use the Earth terminal on the thermostat then your supply cable earth MUST be on the electrical circuit that traces back to the Distribution Unit.Instead of using the Honeywell thermostat earth terminal you can use a connector block to join the Supply & Heater Earth wires as in my photo.I used a 47mm patress box that clips securely to the plasterboard, which is deep enough to conceal earths connected by terminal block, behind the Honeywell Thermostat backplate.The correct wire/terminal configuration for my installation is as follows, using the numbers embossed on the thermostat plastic plate :-1. 'L' Mains Supply2. 'N' Mains+Heater (ie 2 x Neutrals)3. 'L' Heater/Load4 Empty

I bought this as Honeywell is a good brand. I paid a qualified electrician to install it and when he did it simply did not work. It turned my heating on but it would not turn off. He had to uninstall it and go and buy me a different and more expensive one. This cost me time and money so I am not happy.

Easy to use

Very easy to fit and works well.