Central Heating - Room Thermostat Question

[Tesla]

Hi all,

I have a small, 2 bed, semi-detached house.

Brief run down of the heating:

Downstairs Rad's: Kitchen and Lounge.
Upstairs Rads: 1 in each bedroom and 1 in the bathroom.

The room thermostat is in the hall way at the bottom of the stairs.

The problem is that there is no radiator in the hall or on the landing. The hall is always quite cold so we tend to keep internal doors shut.

Therefore, the room thermostat doesn't really do it's job.

The thermostat is surface mounted so I was considering taking it off the wall, drilling through the wall and mounting on the other side, which is the lounge.

Is this advisable?

I guess the kitchen is a bad idea as when cooking it'll give a false reading.

Also, the thermostat is a mechanical type, made by Siemens. It seems to have quite a large "dead" zone. In that the dial will move a few degrees between on and off clicks. Is this a trait of mechanical thermostats? Should I just buy a new digital one and mount in the lounge?

The thermostat is just that, the timer controls are on another module next to the hot water tank.

Thanks for any advice.

 

[dannyjo22]

Why bother, the stat is usually placed in the hall as it's the coldest usually. If this is making your other rooms too warm you just alter the setting not alter the place it's positioned. Seems a bit of overkill. If you move it to another room you will only end up turning it up as it will cut off earlier.

Just set it to a comfortable temp and leave it or fit rad stats as well.

 

[DBT85]

i replaced the old mechanical one with a digital one from the bay for about £25 and its much better. Ours is in the dining room with the big double rad so we keep the door open to the living room to share the love (no rad in the living room).

One of my to do,s next year is at least thermostat valves in the rooms and possibly replace the old ras with newer more efficient ones.

 

[Tesla]

Why bother, the stat is usually placed in the hall as it's the coldest usually. If this is making your other rooms too warm you just alter the setting not alter the place it's positioned. Seems a bit of overkill. If you move it to another room you will only end up turning it up as it will cut off earlier.

Just set it to a comfortable temp and leave it or fit rad stats as well.

I think the problem I have is the hall is always cold. So the thermostat doesn't cut the heating off once the rooms are warm.

 

[Mr. Brightside]

It seems to have quite a large "dead" zone. In that the dial will move a few degrees between on and off clicks. Is this a trait of mechanical thermostats?

Hysteresis is used in a lot of control systems, so yes, and it's probably also a trait of electrical/electronic thermostats. Without it, I imagine switching rates would be too high and you'd get premature component failures.

 

[timmy222]

Also make sure that your radiator temp is set lower then your water temp or the thermosat in the combi will never turn off as it trys to get the rads up to temp but cannot because they are set higher then the water temp.
I found this out through trial and error.