What temperature for boiler for CH?

413x

413x

413x

Caporegime
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Llaneirwg
I have an old boiler (tank style) not condenser.

It has a min-max (no temp) scale on it. Previously it was set to max. No idea what it should be set to.

Max certainly heated the rads quickly. But this isn't really needed. Is there an optimal?

Keep reading 75c ish for condensers.
 
psd99 said:
usually about 65C is reccomended...
Click to expand...

I guess there's no way to really tell if there's no numbers on the dial?

It's just a rotation switch with max and min.
I'll ask my neighbour later. See if he knows. Just wondered if there was anyone who knew on here.
 
413x said:
I guess there's no way to really tell if there's no numbers on the dial?

It's just a rotation switch with max and min.
I'll ask my neighbour later. See if he knows. Just wondered if there was anyone who knew on here.
Click to expand...

My CH dial is just a rotation switch, but then there's a screen elsewhere on the boiler with a temperature. Guess yours doesn't have that though.

I actually thought i remembered reading that it was more efficient to have it in the "max" position if you have something like Nest/Hive, because the thermostat calls for heat depending on the temperature sensor so having a lower boiler temp, just means it might be running longer to get up to temp.

Whereas with older systems where it was just on a timer, you'd want it set to depending on how hot you wanted the house.
 
Martynt74 said:
My CH dial is just a rotation switch, but then there's a screen elsewhere on the boiler with a temperature. Guess yours doesn't have that though.

I actually thought i remembered reading that it was more efficient to have it in the "max" position if you have something like Nest/Hive, because the thermostat calls for heat depending on the temperature sensor so having a lower boiler temp, just means it might be running longer to get up to temp.

Whereas with older systems where it was just on a timer, you'd want it set to depending on how hot you wanted the house.
Click to expand...

This is quite possible. Before it was set to max. And it is noticeable how long it now takes to get up to temp.
Gf was moaning this morning house was cold.

No, no display at all unfortunately.
 
Martynt74 said:
My CH dial is just a rotation switch, but then there's a screen elsewhere on the boiler with a temperature. Guess yours doesn't have that though.

I actually thought i remembered reading that it was more efficient to have it in the "max" position if you have something like Nest/Hive, because the thermostat calls for heat depending on the temperature sensor so having a lower boiler temp, just means it might be running longer to get up to temp.

Whereas with older systems where it was just on a timer, you'd want it set to depending on how hot you wanted the house.
Click to expand...

I think that's incorrect, you want a modern boiler to fire to around to 65 degrees C as that's the most efficient way to utilise waste heat via a condenser and secondary heat exchanger. I believe at high temps you cant condense as well.

"smart" systems from nest, hive, tado and the like don't change this function. They just call for "heat on" from the boiler. You want the boiler to operate as efficiently as possible.

My boiler (and most) identify "E" on the dial for most efficient temp to allow the condenser /secondary heat exchanger process which if memory serves is around 65 degrees, but id need to double check.
 
I've also read it's not the same for a conventional boiler. I think ours is 20 years old. Same as house
 
Buffman said:
My boiler (and most) identify "E" on the dial for most efficient temp to allow the condenser /secondary heat exchanger process which if memory serves is around 65 degrees, but id need to double check.
Click to expand...

This is how mine is setup. The display shows the temperature that the dial is set to.
 
There's no straight answer to this as it depends on your house. Really, you should set it as low as you can whilst still maintaining the correct temperature indoors.

At home, I had mine set to 55C flow for a long time, and then it got colder and I increased it to 60, 65, and 70C at the moment. I'll seasonally commission it based on whether or not my living room is achieving the temperature we want.

So, I think you're best off testing it. But 75C is hot in modern terms, and cold in old terms - a lot of systems were designed to run 80 / 60C flow and return, which is inefficient.
 
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