Chaps

Have a Potterton Suprima boiler, feeding a Megaflow (so unvented heating system) and all works well. This is more from curiosity - the boiler has a dial which is marked temperature, so like a thermostat if you like. Likewise, the megaflow also has a thermostat which we have set and is all fine. Thing is - what should the boiler temperature knob be on?

I've yet to work out if it's on half (ie 12 o'clock) whether this gives a good economy of gas, or whether it should be on full, so it's at the maximum temp to heat the water, or whether it makes no difference because regardless of the temperature of the water travelling from the boiler to the megaflow, it is the megaflow that tells the boiler when it's water is hot enough and therefore to stop heating any more water?

If this is the case, surely the temp on the boiler should be at max to keep the water hotter before it travels to the megaflow?

Slightly anal, but it's been bugging me, so any professionals out there who can tell the answer - whatever it is, would be most helpful and keep an old man happy for a day!

Thanks

Andy

Chaps

Have a Potterton Suprima boiler, feeding a Megaflow (so unvented heating system) and all works well. This is more from curiosity - the boiler has a dial which is marked temperature, so like a thermostat if you like. Likewise, the megaflow also has a thermostat which we have set and is all fine. Thing is - what should the boiler temperature knob be on?

I've yet to work out if it's on half (ie 12 o'clock) whether this gives a good economy of gas, or whether it should be on full, so it's at the maximum temp to heat the water, or whether it makes no difference because regardless of the temperature of the water travelling from the boiler to the megaflow, it is the megaflow that tells the boiler when it's water is hot enough and therefore to stop heating any more water?

If this is the case, surely the temp on the boiler should be at max to keep the water hotter before it travels to the megaflow?

Slightly anal, but it's been bugging me, so any professionals out there who can tell the answer - whatever it is, would be most helpful and keep an old man happy for a day!

Thanks

Andy

The boiler thermostat controls the temp of the water in the radiators and the coil in the megaflo and so needs to be set at 3/4 or 70 deg c ish to enable transfer of heat to the hot water.
The megaflo stat controls the temp of water from the taps and will control the boiler assuming the timeclock is in the on position.
Max position on the boiler stat is 82 deg C.

Mog

Mog

Thanks - makes sense and had not considered that. Your help is much appreciated.

Andy