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Likely 5 wires on hard wired bit, maybe 4 and a link. To me easy, but hard to say how you would find it. So your looking for either replacement programmable thermostat using wifi or hard wired, so step one is work out best option, step two is work out what is the best compromise between best and what can be easy fitted.
So looking at Hive that would likely replace it easy, but that is jumping, first what boiler, and what design of house, and living style, if you have to pay some one, then if the boiler supports OpenTherm or similar, this would be time to up-grade, with gas boilers (not most oil boilers) the boiler can modulate, it does this in the main to extract the latent heat, but tied into that we today try to turn boiler off/on as little as possible and instead allow the boiler to modulate (turn down flame height) as that method saves money and heats the house more even with less of a sine wave for temperature, (low hysteresis) there are two ways to control the boiler, one is a thermostat that connects to ebus, the other is temperature of the return water.
Using the return water temperature is easy, we have a TRV in each room, as they close the by-pass valve opens, and as a result the return water increases in temperature, and the boiler then reduces output, however it has a draw back, it can't turn boiler on, as once it switches off, there is no water flowing to tell it to switch back on, so we fit a thermostat in a room normally kept cold, with no alternative heating, on the ground floor, with no outside doors set to turn off boiler as weather improves. Or some compromise.
With OpenTherm thermostats however they are normally fitted in the main room, and the lock shield set so that room is slower to heat to rest.
All very clever but does not always work, I have a problem with my house, the hall where the thermostat is cools slower than other rooms, so does not turn the boiler back on soon enough. Can set time it takes to heat, but not time taken to cool. And I also have a problem using an oil boiler that does not modulate with over shooting.
So there are some systems that control the temperature in many rooms, the Honeywell EvoHome was the one I saw first, but all manufacturers seem to have produced some thing now on the same lines, odd but not Nest, and Hive uses a different method to most, but the problem is cost, the electronic TRV heads they use to tell the wall thermostat/hub what to do are not cheap when you consider one on each radiator.
So in the main we compromise. But we may do it in a way we can add on latter. I got it wrong, and will admit it so you don't make same mistake, I decided to use Energenie TRV heads then add Nest latter, never did add Nest in mothers old house, and so brought the TRV's to this house, but then found Nest had withdrawn support. I have 9 electronic TRV heads, but oil fired boiler, and find they worked A1 with modulating gas boiler, but not so good with oil.
So there is a thermostat really designed for underfloor heating called a Moes which is seems many are using as cheap and wifi enabled, not a clue how good, but if looking at main stream goods, likely Hive will do what you need. But likely the Drayton Wiser would work better. But if worried about wiring then the TRV heads don't need wiring. So I hope you can do better than I did.
So looking at Hive that would likely replace it easy, but that is jumping, first what boiler, and what design of house, and living style, if you have to pay some one, then if the boiler supports OpenTherm or similar, this would be time to up-grade, with gas boilers (not most oil boilers) the boiler can modulate, it does this in the main to extract the latent heat, but tied into that we today try to turn boiler off/on as little as possible and instead allow the boiler to modulate (turn down flame height) as that method saves money and heats the house more even with less of a sine wave for temperature, (low hysteresis) there are two ways to control the boiler, one is a thermostat that connects to ebus, the other is temperature of the return water.
Using the return water temperature is easy, we have a TRV in each room, as they close the by-pass valve opens, and as a result the return water increases in temperature, and the boiler then reduces output, however it has a draw back, it can't turn boiler on, as once it switches off, there is no water flowing to tell it to switch back on, so we fit a thermostat in a room normally kept cold, with no alternative heating, on the ground floor, with no outside doors set to turn off boiler as weather improves. Or some compromise.
With OpenTherm thermostats however they are normally fitted in the main room, and the lock shield set so that room is slower to heat to rest.
All very clever but does not always work, I have a problem with my house, the hall where the thermostat is cools slower than other rooms, so does not turn the boiler back on soon enough. Can set time it takes to heat, but not time taken to cool. And I also have a problem using an oil boiler that does not modulate with over shooting.
So there are some systems that control the temperature in many rooms, the Honeywell EvoHome was the one I saw first, but all manufacturers seem to have produced some thing now on the same lines, odd but not Nest, and Hive uses a different method to most, but the problem is cost, the electronic TRV heads they use to tell the wall thermostat/hub what to do are not cheap when you consider one on each radiator.
So in the main we compromise. But we may do it in a way we can add on latter. I got it wrong, and will admit it so you don't make same mistake, I decided to use Energenie TRV heads then add Nest latter, never did add Nest in mothers old house, and so brought the TRV's to this house, but then found Nest had withdrawn support. I have 9 electronic TRV heads, but oil fired boiler, and find they worked A1 with modulating gas boiler, but not so good with oil.
So there is a thermostat really designed for underfloor heating called a Moes which is seems many are using as cheap and wifi enabled, not a clue how good, but if looking at main stream goods, likely Hive will do what you need. But likely the Drayton Wiser would work better. But if worried about wiring then the TRV heads don't need wiring. So I hope you can do better than I did.
, I'm going to take the easy option and replace like with like. I can literally then just unscrew wires and reconnect.
