When does your Heating usually go on? - Page 3

Carth · 14-10-2025, 15:37

Quote:

Originally Posted by Taf

Older central heating is affected by 2 forms of hysteresis.

The first is when the thermostat cuts off the heating when it reaches the desired temperature, but the hot water in the radiator continues to warm the room.

My wife suffers from that one. She thinks that when the heating goes off everything should immediately get cold.

I'm often intrigued by her strange thought processes . . . like when she used to leave the outside (garden) lights on "so the cat can see what it's doing out there in the dark"

SnoopZ · 14-10-2025, 17:27

Quote:

Originally Posted by thenry

The boiler cuts out when the thermostat clicks and vice versa temperature low temperature high. There is no lag. The boiler stops heating but circulation continues. Just the gap in temperature reading is of an issue

---------- Post added at 12:56 ---------- Previous post was at 12:17 ----------

I just realised I don't have home broadband, I tether from the device that is with me on my travels so remote control isn't an option. I will still chase an upgrade.

Yeah, a smart thermostat will be useless to you without home broadband when not at home.

tweetiepooh · 15-10-2025, 09:35

If we could have had a Worcester thermostat with our new boiler then the pump would keep running after the flame had cut off. (We couldn't because the Worcester thermostat needed mains and there are no sockets near where we need to site the thermostat.)

SnoopZ · 15-10-2025, 10:28

Quote:

Originally Posted by tweetiepooh

If we could have had a Worcester thermostat with our new boiler then the pump would keep running after the flame had cut off. (We couldn't because the Worcester thermostat needed mains and there are no sockets near where we need to site the thermostat.)

My Ideal boiler pump sounds like it keeps running after the flame goes out for a short time and my Hive wall thermostat is battery operated and it's control unit is where my old control unit was in my airing cupboard, my plumber wired everything in to code, so I would have thought your plumber should have been able to do yours too and connect it to the same power he connected your boiler to.

---------- Post added at 10:28 ---------- Previous post was at 10:10 ----------

What are peoples boiler control temps set at, I guess mines set too high at 80c and I could turn it down to 60-70c and still get efficiency? I guess a plumber often turns it right up when it's fitted and being serviced and often leave it there.

Carth · 15-10-2025, 10:38

When ours was fitted it was set at 60, wife moaned the water was too hot so I reset it to 50.
She then moaned the water wasn't hot enough, so I put it back to 60 and told her it was now at 55.

No complaints

Sometimes it's like living with Goldilocks

SnoopZ · 15-10-2025, 10:45

Quote:

Originally Posted by Carth

When ours was fitted it was set at 60, wife moaned the water was too hot so I reset it to 50.
She then moaned the water wasn't hot enough, so I put it back to 60 and told her it was now at 55.

No complaints

Sometimes it's like living with Goldilocks

I've set mine to 60c and I'll see how it affects my Mega flow hot water tank and radiators as well as my gas usage.

thenry · 15-10-2025, 10:47

The gas man will have a service mode no need to raise or lower temperature. Mine as I mentioned was set at 43 when installed with advisable increase of 5-10 in the winter period. I don't follow that advice anymore. During the gas and electric hikes the advice given by government was to set the boiler at 60 so I did so. My water is set to 50 because my shower only goes that high, anything more would be a waste tbh the taps are mine at 50.

Did you gas man toggle your boiler to be in comfort mode so hot water is always readily available instead of the boiler manually calling for hot water when you turn the tap on? Mine is off. It adds to the bill considerably when on.

There's no efficiency while your boiler is set too high. The whole point of it is to steam inside, recycle the heat your boiler produces. Your boiler must be extracting a lot of heat through the exhaust pipe.

SnoopZ · 15-10-2025, 11:07

Quote:

Originally Posted by thenry

The gas man will have a service mode no need to raise or lower temperature. Mine as I mentioned was set at 43 when installed with advisable increase of 5-10 in the winter period. I don't follow that advice anymore. During the gas and electric hikes the advice given by government was to set the boiler at 60 so I did so. My water is set to 50 because my shower only goes that high, anything more would be a waste tbh the taps are mine at 50.

Did you gas man toggle your boiler to be in comfort mode so hot water is always readily available instead of the boiler manually calling for hot water when you turn the tap on? Mine is off. It adds to the bill considerably when on.

There's no efficiency while your boiler is set too high. The whole point of it is to steam inside, recycle the heat your boiler produces. Your boiler must be extracting a lot of heat through the exhaust pipe.

I've got a modern condensing boiler but it's also a system boiler because I kept my tank so I'm not really sure if the boiler temp just affects radiator temp because the tank has a dial on it for temperature under a screwed panel, I guess I'll find out in a few days.

Edit- I remember when I bought the house 28yrs ago I had to turn up the tank temperature because the hot water never got hot enough so I guess I have answered my own question.

thenry · 15-10-2025, 11:12

Oh. Then what I said doesn't apply to you. My combi boiler does water and heat instantly no tanks. My airing cupboard is so spacious now.

Taf · 15-10-2025, 11:18

Quote:

Originally Posted by thenry

Oh. Then what I said doesn't apply to you. My combi boiler does water and heat instantly no tanks. My airing cupboard is so spacious now.

It's the same here. No tank of pipes in the attic to freeze, and all that extra space for storage where the hot tank used to be.

Our combi cannot have the hot water temperature adjusted because:

"A UK boiler's hot water temperature should be at a minimum of 60C to kill Legionella bacteria, as recommended by the HSE. "

But I thought that was only in the case of you having a hot water storage tank?

SnoopZ · 15-10-2025, 11:20

Quote:

Originally Posted by thenry

Oh. Then what I said doesn't apply to you. My combi boiler does water and heat instantly no tanks. My airing cupboard is so spacious now.

I'm not sure why 3 plumbers all said keep the Mega Flow tank rather than change to a Combi but I kept it as also a neighbour did too. I'm told the Mega Flow will give me better water pressure on my hot taps for a shower and the added benefit is it has a built in emersion heatercwhich has saved me atleast 4 times when I've had no hot water due to boiler issues, the main one being last late Christmas for a whole week, it died the night before I returned home and the house temperature dropped to 8c!!!! As it was a super cold period.

Ultimately I couldn't be happier with my current setup but it would have been nice to have an empty airing cupboard.

Carth · 15-10-2025, 11:22

Quote:

Originally Posted by thenry

The gas man will have a service mode no need to raise or lower temperature. Mine as I mentioned was set at 43 when installed with advisable increase of 5-10 in the winter period. I don't follow that advice anymore. During the gas and electric hikes the advice given by government was to set the boiler at 60 so I did so. My water is set to 50 because my shower only goes that high, anything more would be a waste tbh the taps are mine at 50.

Did you gas man toggle your boiler to be in comfort mode so hot water is always readily available instead of the boiler manually calling for hot water when you turn the tap on? Mine is off. It adds to the bill considerably when on.

There's no efficiency while your boiler is set too high. The whole point of it is to steam inside, recycle the heat your boiler produces. Your boiler must be extracting a lot of heat through the exhaust pipe.

*point one: never listen to Government advice, they know less than you do.

*point two: efficiency (to me) means setting the boiler temp to something which heats the water and therefore the radiators to a level where I feel comfortable in the house, not setting everything so I save 14p a day on the cost and wear thermal underwear

thenry · 15-10-2025, 17:48

I've had a rethink, I can't go into the winter with 15.5 on the thermostat. I have a professional booked for Friday morning. I only need a heating thermostat. Any recommendations please? Smart or digital. I'm not going for a manual dial thermostat again that's for sure

**Paul** · 15-10-2025, 17:50

System boiler, set to 66C.
Water is set to just above 60C.

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As I understand it, setting condensing boilers too high stops them working efficiently.

SnoopZ · 15-10-2025, 20:21

Quote:

Originally Posted by thenry

I've had a rethink, I can't go into the winter with 15.5 on the thermostat. I have a professional booked for Friday morning. I only need a heating thermostat. Any recommendations please? Smart or digital. I'm not going for a manual dial thermostat again that's for sure

A smart thermostat isn't any use to you outside the house with no home broadband unless you can sort that out.

I was looking at both my room clock thermometers today and they were pretty spot on when comparing to my Hive on my phone app.