FAO of Max

[Itchysphincter]

Boiler question. Thank you please.

I have a Vailant gas combi that I put in new 10-12 years ago. It’s been serviced on the dot by Cyril’s mob every year and has never let us down.

With all this talk of setting thermostats and turning heating on/off to save money I took a look on the Vailant website and it says to fix the boiler at 60-65 degrees (iirc) for the combi part to kick in and for the boiler to be efficient. Any higher or lower and don’t get the bang for your buck apparently.

So the question is - do I set the boiler at that 60-65 degrees temp and turn the rads down or do I turn boiler temp down and leave the rads up? Is there a saving to be made by cranking the boiler up to make the combi efficient and turning the rads down so it’s not too hot?

 

[Cooperman]

How are you turning rad temp down, by restricting flow to the rad? I don’t see a point in this as you’ll still be heating the water in the pipes that lead to the rads.

To continue what I wrote in the other thread, we are burning much less gas by having 18° target over 24hr period, as opposed to completely off at night and try to heat house up from 14° in the morning.

 

[WxmJax]

There's something about legionella bacteria if you turn the boiler down too low here

https://www.bbc.co.uk/news/business-62738249

 

[Niigata Jack]

Boiler question. Thank you please.

I have a Vailant gas combi that I put in new 10-12 years ago. It’s been serviced on the dot by Cyril’s mob every year and has never let us down.

With all this talk of setting thermostats and turning heating on/off to save money I took a look on the Vailant website and it says to fix the boiler at 60-65 degrees (iirc) for the combi part to kick in and for the boiler to be efficient. Any higher or lower and don’t get the bang for your buck apparently.

So the question is - do I set the boiler at that 60-65 degrees temp and turn the rads down or do I turn boiler temp down and leave the rads up? Is there a saving to be made by cranking the boiler up to make the combi efficient and turning the rads down so it’s not too hot?

I can check the MI's for you, but I wouldn't go against what the manufacture say, I've a Vailant ecotec 828 which I fitted in 2002 and its still going strong, its had a few bits changed but still, I keep water temp at 55 degrees and Heating 60 degrees myself.
If you got TRV's on your rads [I've got them} use them to keep the temperature as you want and leave boiler set around 60-65.

 

[Niigata Jack]

There's something about legionella bacteria if you turn the boiler down too low here

https://www.bbc.co.uk/news/business-62738249

Keep the water temperature around 55 degrees or just above, as long as you haven't got dead legs end's of pipework full of water that doesn't move, taps that don't get used etc you'll be fine, keep shower heads clean as well by soaking them in a diluted bleach regular.
Legionella thrives in stagnant water between 19-20 degrees and 50 degrees.

 

[Neath_Jack]

How are you turning rad temp down, by restricting flow to the rad? I don’t see a point in this as you’ll still be heating the water in the pipes that lead to the rads.

To continue what I wrote in the other thread, we are burning much less gas by having 18° target over 24hr period, as opposed to completely off at night and try to heat house up from 14° in the morning.

He's probably got thermostatic valves on them, which is what i have on mine. Mine are basically off, or set at a number between 1 and 5.

 

[Niigata Jack]

He's probably got thermostatic valves on them, which is what i have on mine. Mine are basically off, or set at a number between 1 and 5.

Rads need to be balanced to get near enough equal heat, system also needs to be clean [clear of iron-oxide] to get the best out of a heating system.

Heating a house efficiently goes further than that though, as you'd know NJ, eliminate drafts as best you can, insulate loft etc

 

[Itchysphincter]

He's probably got thermostatic valves on them, which is what i have on mine. Mine are basically off, or set at a number between 1 and 5.

Yes.

 

[Itchysphincter]

I can check the MI's for you, but I wouldn't go against what the manufacture say, I've a Vailant ecotec 828 which I fitted in 2002 and its still going strong, its had a few bits changed but still, I keep water temp at 55 degrees and Heating 60 degrees myself.
If you got TRV's on your rads [I've got them} use them to keep the temperature as you want and leave boiler set around 60-65.

I do the water thing too. Got home a couple of hours ago and the house was glowing red hot at that temp even with the rads down, went back out with dog and it feels even hotter now. It feels like I need to turn the boiler temp down but I’ll persevere with the rads and finding the right temp if it’s for the best.

 

[Niigata Jack]

I do the water thing too. Got home a couple of hours ago and the house was glowing red hot at that temp even with the rads down, went back out with dog and it feels even hotter now. It feels like I need to turn the boiler temp down but I’ll persevere with the rads and finding the right temp if it’s for the best.

Have you got a Hive, Nest thermostat or room stat ? if yes control temps from one of those and just leave boiler at 60, never touch our boiler we just use Room Stat.