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Back to the challenge of optimising the Boiler/radiator performance. I get the feeling that the condensing boiler would prefer the set up to be static with no variables to affect the performance. A little knowledge is a dangerous thing but this is what I've gleaned from t'internet 'experts'...

For a professional engineer your attention to detail is lacking. You're having a pop at @johna.clements for a comment I made. You said: 'Second in broad terms (all other things being equal) the hotter you drive your water temperature up the greater the rate of heat loss. You need to match your...

That seems counterintuitive when trying to cut heating bills. Surely the TRVs will shut off at low temps and you're back to square one. Unless you have a smart pump? I should add that I have a wood burner that I'll be using to heat the downstairs on cold evenings and sometimes during the day...

I get the need for a condensing boiler to run at a lower temp, the need for the temp difference on the return and to use bigger rads. Sounds like the smart pumps are a recent attempt to give this type of system a chance to work efficiently. I have 10 radiators and an area of underfloor...

Nest information seems fairly hard to find. The bacteria prevention feature is not mentioned in the App so people are unlikely to know about it. I wouldn't have spotted it without the data from the Smart meter. Now I need to decide whether to disable it or not. Didn't have it before Nest so...

I believe I have an answer to the unexplained gas usage. The Nest system has a Bacteria prevention feature. It will kick in if the HW has not been heating continuous for 2 hours in the past 48 hours. I have played around with the HW schedule to use short bursts (less than 2 hours) so the...

Just had a chat with my heating engineer neighbour. He is upgrading the next door neighbour's system. Only had time to discuss the unexpected use in the middle of the night. He's had calls from other customers with similar unexpected use. He thinks it might be a new software release from Nest...

My bad. I did a very quick skim 😬

My HW cylinder is set to 60c (by the heating engineer) I thought this was to kill off any Legionella. Interesting that the official guidance from HSE is 50c min https://www.hse.gov.uk/pUbns/priced/hsg274part2.pdf Page 31.

Or a gas leak!

I did have a brief look at return temps on my new boiler. I played around with the output temp. With the new boiler and pump it is slower to heat up than the old non-condensing boiler. It is cheaper to run though. Reducing the boiler output temp to bring down the return temp just meant the...

Sounds like a faff to me. I've been swayed towards heating the HW just before it's needed, e.g., daily showers. If heated to 60c it has a lot less time to lose the heat and as it gets used the temp comes down anyway. If I don't have a regular shower schedule then a 30 min boost before we need...

Sounds like conspiracy theory stuff to me. Presumably the suppliers are acting as a cartel and all in on it? Perhaps you can give some examples of suppliers manipulating usage.

At least it is telling me there's a potential issue! Unless you stay up all night doing meter readings how would you know you have unexplained consumption with your dumb meter?

I'm going to change the schedule again on the back of advice and I'll keep an eye on it. I'm with London Power (Octopus Energy). I'll take it up with them if there is further unexplained consumption.

60-65c is the recommended temperature

HW only comes on twice a day (from today) previously three times. Definitely not set to 24hrs.

Only had these overnight anomalies 5 nights in the past week and nothing before then. I have a vented system with an insulated copper cylinder. I will insulate the pipes. The pump put in when the boiler was replaced was not up to the job and got upgraded. Still not as good as the old one.

Schedules are very simple

I use Nest. I can see in the App usage history that there is no call for heat from the thermostat. I think the idea of heating the hot water before the room heating is a good one. Better to heat one circuit at a time rather than two. Interesting suggestion about 15:30 - 21:00 I guess it...