What temp should I set the CH on our condensing boiler?

[Leesa1966]

My baby son has just turned down the CH temp on our condensing boiler and I can't find anything in the handbook about what temp it should be set at. What should I set it at so the kids don't get burnt? Thanks

 

[Steady]

Set it on max.

 

[D_Hailsham]

My baby son has just turned down the CH temp on our condensing boiler and I can't find anything in the handbook about what temp it should be set at. What should I set it at so the kids don't get burnt? Thanks

Put his name down for a plumbers course when he's older.

Are you talking about the temperature control on the boiler? If so, set it to 75C and check that the house gets warm and stays warm. Turn up/down if necessary.

Radiators are typically anything up to 80C.

 

[Leesa1966]

Max for the radiator setting on the boiler is 82C. Surely a young child touching a radiator at 82C will get burnt!

 

[Leesa1966]

My baby son has just turned down the CH temp on our condensing boiler and I can't find anything in the handbook about what temp it should be set at. What should I set it at so the kids don't get burnt? Thanks

Put his name down for a plumbers course when he's older.

Are you talking about the temperature control on the boiler? If so, set it to 75C and check that the house gets warm and stays warm. Turn up/down if necessary.

Radiators are typically anything up to 80C.

Sorry only one reply when I first replied. Yes I am talking about the radiator temperature setting on the boiler. Through trial and error I am currently up to 60C. We have thermostatic controls on each rad and no room thermostat but feel that at 60 the radiators are a bit too hot for an 18 month old with more curiosity than sense!

 

[D_Hailsham]

Max for the radiator setting on the boiler is 82C. Surely a young child touching a radiator at 82C will get burnt!

Heating systems are designed for a radiator surface temperature of about 70C! It's just a case of finding the lowest temperature at which the house will reach and maintain the required room temperature. 75C is a good starting point. This is ideal weather for doing that. Once you have set it, you don't need to change it as the weather improves - the boiler takes care of that.

Just seen your last post about setting it to 60. If you are really concerned, you will have to change your rads to LST types (low surface temperature), which are usually put into old peoples homes!

 

[gas4you]

If you have a combi then if you get warm enough with it set at approx 60-65c then leave it at this.

If you have a hot water cylinder, then start at 65c.

You don't want a condensing boiler on max because this will limit the amount it will condense, so cost you more in gas.

The return water to the boiler should be no more than 56c.

 

[Gasman77]

If you have any external condensate pipework, i'd have it on max until the temp pics up - rads too hot are better than no heat at all!

then drop it back to about 3/4 when warmer outside

 

[Leesa1966]

You don't want a condensing boiler on max because this will limit the amount it will condense, so cost you more in gas.

We have a condensing boiler(Glowworm Ultracom hxi). As I said max is 82C

 

[gas4you]

Try 65-70c then.

You need a minimum of 65c if your hot water cylinder is heated to the usual 60c.

 

[Axel]

A hot radiator is a good way for small children to learn about the dangers of touching potentially hot things - it will hurt but shouldn't cause any permanent injury.

 

[satansbrother]

A hot radiator is a good way for small children to learn about the dangers of touching potentially hot things - it will hurt but shouldn't cause any permanent injury.

Unless you hold his face against it for 10 minutes. He won't go near your rads again!

 

[Leesa1966]

Well we did find my son licking a frozen metal gate yesterday so who knows what he would do with rads.

Anyway thanks for the all advice. We set the rads at 75C yesterday which seems about right in terms of house temperature.

By the way is there a recommended hot water temperature if children learning to wash hands?

Thanks

 

[Steady]

Quote from user manual, Worcester Bosch Greenstar boilers:


<< TIPS ON ENERGY SAVING

Central heating systems with room thermostats/thermostatic radiator valves

The central heating control on the boiler should be set to the maximum rated temeperature of the central heating system. The temperature of each room can be set individually(except primary room with the room thermostat) using the thermostatic radiator valves. >>



If they say max then it must be right. I seem to remember reading somewhere that max temp setting on boiler is kinder to your heat exchanger.

 

[D_Hailsham]

Quote from user manual, Worcester Bosch Greenstar boilers:

The central heating control on the boiler should be set to the maximum rated temperature of the central heating system. The temperature of each room can be set individually(except primary room with the room thermostat) using the thermostatic radiator valves.

That throws weather compensation out of the window!

What is the "maximum rated temperature of the CH system"?

Radiators outputs are stated for a flow temp of 75C, return of 65C; but condensing boiler can be run at any temperature, e g flow of 60C, return of 40C. So, if you design a system for those temperatures and size the radiators accordingly, are you still expected to run the boiler at 80C?

I suppose the clue is in the word "system", not "boiler".

I seem to remember reading somewhere that max temp setting on boiler is kinder to your heat exchanger.

This was true with old boilers with cast iron heat exchangers. It does not matter with modern aluminium and stainless steel ones. If it did, the boilers would not be able to condense.