15 minutes heating

Spoonie_Turtle

Brebal said:

BUFF said:

In theory the higher the temperature differential to outside the higher the heat loss so there should be a higher heat loss from maintaining 16C overnight (let us say 8hrs) compared to letting it drop overnight to say, 14C & reheating to 16C in the morning.
Whether it's actually measurable in a real house would depend upon size of installation &  having 2 absolutely identical test days (unlikely).

I’m going to have to try and test it as best I can I reckon. Seems daft to have the heating coming on when I’m tucked up in bed. 

We have a heat pump so not exactly a comparable system, but this year we have turned the heating off overnight because it kicking in at 3am just feels so wrong, especially with the prices now.

Unfortunately I haven't known how to keep track of usage until very recently so won't be able to compare specifics, but we'll be able to compare annual consumption for both water and heating so will know by the end of the year if it made any difference.

Miser1964

> Checked the smart meter before i switched on and it cost me £0.60 for 15 minutes<

Seems implausible. 60p at the EPG unit rate of 10.33p kWH would mean consuming 5.8kWh of gas in 15 mins. Average household gas consumption is 33kWh per day. 

[Deleted User]

Miser1964 said:

> Checked the smart meter before i switched on and it cost me £0.60 for 15 minutes<

Seems implausible. 60p at the EPG unit rate of 10.33p kWH would mean consuming 5.8kWh of gas in 15 mins. Average household gas consumption is 33kWh per day. 

If you have a 24kW gas boiler and you are trying to heat up a wet heating system then 5.8kWh is perfectly possible. It would equate to 23.2kW of gas used in the first hour or 23.2kWh.

Theoretically, running a 24kW boiler for an hour will consume 24kWh.

Gas boilers modulate downwards as radiators reach their set temperatures so kWh consumption drops off. There will also come a time when the boiler cycles on and off. The graph below shows kWh usage every 30 minutes. Add up the 4 bars from 0700: you will see the usage in the first hour is >20kWh.

Mstty

We haven't turned our heat pump heating on at all this year.

A couple of mornings the kitchen has gone as low as 16oC but a quick blast with a fan heater there sorts it out. We do more cooking indoors this time of year so all that energy use translates to heat in the house. Compared to last October we are heading for a 250kwh electricity saving over the month (we are electricity only)

This is mainly due to the fact we are having a very mild winter I would suggest and our energy saving ways we introduced this summer.

Grogsy78

You would think there would be a product you could attach to the radiator that could be heated up by the radiator but then cools down far slower than water which would help keep your house warmer for longer 

[Deleted User]

Grogsy78 said:

You would think there would be a product you could attach to the radiator that could be heated up by the radiator but then cools down far slower than water which would help keep your house warmer for longer 

You mean a storage heater? They exist.

Doesn't change the laws of physics though - if you want a certain amount of heat out of a thing, you have to put that much in to start with.  It wouldn't keep your house any warmer for any longer if it only used the same amount of energy.