Views please on gas usage

markin

As long as the outside temp and inside start temp are close just calling for heat for 2 hrs should show if gas usage in hr 2 is more or less in hr 2, But if its too warm outside it may not use any gas in hr 2 at any flow temp.

badger09

Astria said:

If you have really tiny fingers then you can tap the blue bar bits and it'll told you how long the bit took

I have really tiny fingers but can only get down to a 7minute heating slot😊. Is there a prize if I can manage a shorter one?🤓

vic_sf49

Right oh, some stats from the boiler flow temp experiment....and the results aren't as clear cut as I expected.

Most heating periods were 2 hrs long, although with the lower flow temp, it obvs took longer to heat the house up.

Therefore I recorded a couple of sessions, to see how much gas was used to get up to my desired temp.

- Return Flow Temp = measured with Brannon pipe thermometer.

- Return Flow Temp = (in brackets) assumed to be the same as measured.

- Outdoor Temps = Met Office.

- Indoor = Hive Thermostat.

- Usage = Bright App.

vic_sf49

I'll be continuing this experiment, with flow temp settings between the 3.5 and 5.0, as I hope there's a sweet spot between those settings.

I won't bother posting that though, as you've all already died of boredom.

Astria

vic_sf49 said:

I'll be continuing this experiment, with flow temp settings between the 3.5 and 5.0, as I hope there's a sweet spot between those settings.

I won't bother posting that though, as you've all already died of boredom.

It's also interesting to read, so please do

Raxiel

Astria said:

vic_sf49 said:

As I'm experimenting alongside @spudwood, I've just gone through Hive* and Bright app data, for before I turned my flow temp down.

But, hive has just gone on the fritz, and I'm not sure I have a full 2hr period of heating post flow temp change.... yet.

Numbers will be forthcoming when I have some data.

* I only have the free hive historic data, rather than the extra paid for version, so seeing when I've had my boiler firing continuously for 2hrs, is not the easiest.

Hive can typically only tell you when it's requested heat, it can't tell you when the boiler has been firing and for how long.

My boiler fires for about 15 minutes, then idles for 10 minutes before firing up again, The property is normally upto temperature before the boiler has fired up a second time but hive regards it as the boiler has been running for 25 minutes. I tried the paid for version on a free trial but it seemed to estimate cost based on this limited data.

The only way of accurately measuring gas usage is therefore from the gas meter.

I don't know about Hive, but the Worcester Bosch Wave thermostat can measure the actual gas usage when paired with a compatible boiler. We have one with our 7 year old Greenstar. It's not presented in the most user friendly way, giving only the total kWh for the year or a monthly graph you can count pixels on.

The total is pretty accurate though, closer to the Octopus app total than the IHD, less than 2% off, likely down to different fixed CV values I'd guess.

Probably not much help for OP since they don't have one, but putting it out there.