Rad temps

[smhstu]

Hi allGot a custard who thinks that there's something wrong with a few rads cause there not hot enough, I mean they put there hand on and it doesn't take the skin off so they think it's not hot enough, even though there not cold!
So what is the temp of a rad supposed to be when boiler on full.?
I just want to go in with the correct info.

 

[SimonG]

Pinch the rad and if you can't hold it for ten seconds it's too hot. Just as a rule of thumb.

 

[Keefy]

Pretty sure it's 82 degrees on the flow and 71 on the return. Can anyone clarify?

 

[dancinplumba]

Pretty sure it's 82 degrees on the flow and 71 on the return. Can anyone clarify?

depends on what design temp drop is of system. is room not getting hot enuff ?

 

[smhstu]

Room temp is ok but they have a towel rad in the kitchen which is scalding hot they think all rads shoul be like that!

 

[tamz]

You could try balancing the system

 

[REDSAW]

Pretty sure it's 82 degrees on the flow and 71 on the return. Can anyone clarify?

what, at the boiler?
65-55

 

[doitmyself]

Got a custard who thinks that there's something wrong with a few rads cause they're not hot enough. So what is the temp of a rad supposed to be when boiler on full.?

Which boiler is it?
What is the flow temp setting?
What controls do they have?

The surface temperature of my rads currently is about 50C and the house is lovely and warm at 21C. The only time I get higher temperatures is first thing in the morning when the house is heating up from 'cold', i.e approx 15C. (I don't keep the heating on overnight; it's just well insulated.)

If it is a very old boiler, the rads will have been sized for a 90C flow/70C return. That changed in the 1990's to 75C flow/65C return. Modern condensing systems should be sized for a 75C flow/55C return. The output of a radiator is dependent on flow, return and room temperatures.

 

[albabe]

Design Temperatures.
82C Flow. 71C Return. Christian terms 180F / 160F.
Room Temp 21C (70F)
These are used to test radiator outputs.

 

[doitmyself]

Design Temperatures.
82C Flow. 71C Return. Christian terms 180F / 160F.
Room Temp 21C (70F)
These are used to test radiator outputs.

NO they are not.

BS EN442, which all rad manufacturers have to adhere to, require the rad to be tested at 75C flow, 65C return and 20C room. That has been the case since 1997. The now obsolete BS3528 tested radiators at 90C flow, 70C return and 20C room.