House Slow to Warm Up

[chris.tarry85]

I've been playing around with some of the output available from our new Hive thermostat to try and understand why our house is slow to warm up once the heating comes on:



As the above shows, the temp drops very slowly once the heating goes off at 8:30am until it comes back on at 2:30 (drop of 0.9 degrees), however it then takes ages to warm up to the set temperature.

Am I right to presume that the slow reduction when the heating is off makes insulation / heat leakage less likely to be the cause?

I'm beginning to think I need to measure and size my radiators to make sure they are sufficient for the rooms.

Am I missing anything?

[chris.tarry85]

It's a 60's house with a 90's extension.

Radiators are bled and hot, although some are on microbes piping which is not ideal.

Combi boiler so flow temp set to condense, some radiators are single panel so not a good combination.

[chris.tarry85]

Thanks All, to answer some more questions:

- Fairly modern combi boiler
- Detached house

I think the next step will be to replace some of the single panel radiators with doubles.

[chris.tarry85]

Downstairs is pretty open plan yes - we always keep the door into the porch shut but most others are open.

[chris.tarry85]

The graph was from Sunday, it was snowing in the morning and certainly less than 5 degrees outside.

We have topped up the insulation and have less than ten year old windows, so it's not all 1960's standard.

The radiators (especially where we don't have micro bore piping) are hot rather than just warm, so I don't think its a flow temp issue.