thermostat with a small differential + anticipator?

[Mark07]

Should we be telling peeps how to do a sparkys job ? Could be 230v involved and possibly Boiler case removal

Don't worry dancinplumba, I would never risk doing a sparkys job. That is why I wrote that the battery version would be cheaper for me as I would be able to do it myself.

 

[Gasmk1]

they use a resistor to heat up, thats why it uses a neutral.

and that was my thoughts on a battery

 

[chris watkins]

But as I understood it, anticipators have a little heating element. Can a battery powers that? Wouldn't the (small) battery be drained in a few weeks, if not days?

The battery in the wired digital stat's power the electronic temperature sensing to 0.5 deg C accuracy it also operates the switching so you can use it to control different voltages (known as volt free switch).
There is no anticipator in these new one & the battery in my Honeywell one has lasted over two years (2X AA).

You need to take great care if you are doing the change your self, as others have said.
The cable marked green / yellow was often used by some (cowboys) as a Neutral this is dangerous as every cable must carry an earth even if the fitting it is connect to is double insulated & does not require one it is there to protect the cable.

Have you got a combi boiler of standard S or Y plan (hot water cylinder) ?

 

[Howsie]

Take a look at EvoHome, very clever stuff but a little of the dear side for some.

 

[Mark07]

Thanks for the info chris watkins,

I am not going to do it myself if it involves new wirings.

I wouldn't even be allowed, as we live in a rented house, I will have to talk to my landlord after this research, and get his permission for the upgrade. I'll see if he can pay for it too but I very much doubt it... But obviously I don't want to spend much on a rented house, considering that in Britain a private landlord can evict tenants at will with only 2 months notice!

We have a conventional boiler, with a water tank in the attic.

 

[Mark07]

Thanks Howsie,

Unfortunately we can't spend much, for the reasons I explained to chris watkins above.

 

[Mark07]

I had an idea, to reduce the "overshooting" of temperature in the house without the need to change the Thermostat: At the boiler's settings, reduce the water temperature for the heating system.

This way, when the house reaches the desired temperature, the radiators won't be as hot, and the overshooting will be less. The question is if this improvement will be significant.

Another advantage will be that all changes in temperature will be smoother, more gradual, also on the way up.

 

[chris watkins]

I think you may have stumbled on something there Mark07 so what you are saying is as the outside temperature increases you are going to turn down the boiler thermostat so the rads give out less heat ? Not only will that stop the temperature over shooting but it will improve the efficiency if your boiler is a condensing type because the returning water will be below 53deg C.

Now the problem is that you will have to stand next to the boiler & adjust the water temperature all the time as the weather & outside temperature changes all the time.
Your thermostat is inaccurate not only on the rise in temperature but also on the drop so you will still find your house getting cold before the stat calls the heating back on.

If you heat our domestic hot water via the boiler then the minimum setting on the boiler stat will need to be around 70 deg C when the water is being heated.

There is an automatic system that does just what you want & it saves you standing there adjusting the stat it is called a Weather Compensation control.

It might just be a lot easier & cheaper just to change the room state.

 

[Mark07]

Yep, we decided to buy a new thermostat, with a smaller differential, and easy to install = battery, so, no 3rd wire and no anticipator.

Now we just have to chose one, probably with a 0.5degree differential. Any suggestion, please?

 

[ShaunCorbs]

Yep, we decided to buy a new thermostat, with a smaller differential, and easy to install = battery, so, no 3rd wire and no anticipator.

Now we just have to chose one, probably with a 0.5degree differential. Any suggestion, please?

go for a branded one eg honeywell drayton etc