Setting heating programmes.

[Screech20]

Hey guys.

We've finally got rid of our old system that we had no control over and now got a combi boiler.
I just need to fit the controller, a Honeywell CMT927.

I know it's going to take a bit of experimenting to find the most comfortable temperatures, but just wondering if there's any advice on a starting point.

Also, is it a good idea/more cost effective to have it on at a reduced temp. At night and when we're out? Or turn off all together?


Cheers.

 

[Diyisfun]

Start with low temp settings, then increase, else its like putting a big coat on & saying it fits. If you put a small one on, you know it's not fitting & get a bigger one.

 

[D_Hailsham]

We've finally got rid of our old system that we had no control over and now got a combi boiler. I just need to fit the controller, a Honeywell CMT927.

Why didn't the boiler installer also install the 927?

Start at 20C. If no one complains, drop it half a degree at a time,without telling anyone, until someone complains. Then put it up half a degree.

Of course if someone complains at 20C, you will have to put it up half a degree.

is it a good idea/more cost effective to have it on at a reduced temp. At night and when we're out? Or turn off all together?

That's impossible to answer. It all depends on how well the house is insulated and your lifestyle. You will have to experiment.

Don't forget that the CM927 works to temperatures, even overnight, so you might have a day temp of 20C and a night of 10C.

My house is well insulated and the overnight temperature never drops below 17C. The CM927 is set to 6C for overnight just as a precaution.

We are retired, so the heating is on all day. If the house is going to be empty for a long time during the day, I use the "party" button to set a lower temperature, say 18C, until an hour before we return. This saves adjusting the normal settings.

 

[alan333]

Also, is it a good idea/more cost effective to have it on at a reduced temp. At night and when we're out? Or turn off all together?

I checked this out on my house, it's a fairly new and reasonably insulated 4 bed house, and we have trv's on our radiators. My conclusion was that gas usage was about the same doing either...
Setting at 18 deg when out or in bed, and turning up to 21 deg when in/up. Or
Turning off when out, and turning up to 21 when in.

I reckon the structure of the house gets colder if you turn it off, so it uses more energy to get back up to temp. I find it better to set to 18 deg cos the house never feels baltic, irrespective of when you're up and about. It also doesn't take so long to heat back up to 21 deg.