TonyT

Your first link is a complete hole saw that will fit the drill and get you going. your second is what trades generally use, so you can swap out hole saws and arbours when individual parts wear

And do you suffer from power cuts? I would rather go trace heating and anti freeze balance to get a better efficiency all year round

BES pluming supplies sell stuff under £5 litre

Trace heating on external pipework would be cheaper and not affect efficiency like glycol does.

What type of boiler do you have? hiw long to you have the heating in for ? what temperature do you try to achieve on a thermostat? has it ever achieved this temperature? some more info may help diagnose

rough looking install unfortunately maybe some picture of the manifold set up might help

Yes you are being unreasonable

Put more tape on, I use 15 turns on my TRV’s. Tape is cheap, return visits and call backs are more expensive. you could always use a potable water sealing paste too

Apologies if this is incorrect but why is a mcb feeding a rcbo? A rcbo contains the same function as a mcb.

Phone the gas board and advise of smell. might be meter, supply pipework, underground pipework serving house. flue gases are been blown back in?

Not following, that’s my savings, house is warm all the time and a bit cheaper than what it was when it was on/off controlled, back then it could be too hot and too cold Thats for my house, with my gas boiler. so I’m sure with your recently modernised house you will see savings

Find an equivalent boiler and just get quotes based on that, less hassle add magnetic filter, weather compensation maybe a viesmann so it can modulate down to a low setting

See my gas consumption for last month, heating on for 45 minutes in the morning before we got up and in the evening for an hour, plus any time extra we were cold. house felt too warm and too cold at times we are in a Scotland. This month the weather compensation has been activated from 6am to 11pm house is constantly at an even temp. gas is also used for cooking and HW

If you are reluctant best get some samples taken to give you peace of mind

Yes, not full banned until 1999. https://www.hse.gov.uk/asbestos/introduction/index.htm

It doesn’t change the temperature of the water, that’s set by the immersion heater thermostat that was fitted before the Eddi was installed. it just lets you use your PV instead of buying in/importing energy

Yes I’m sure that will help the OP.

You need to know how much you pay for a unit of electricity. if you had a 1kW heater on for 1 hour it would consume 1units worth of electricity.

Making anything like that is to much of a faff, when you can buy something out the box and install dont get me wrong ideal tinkering project, but I don’t want the home brew look on my installs

Assume the felt is overlapped the right way? any adhesive used on the laps?

Air con can be 300% plus efficient in heating or cooling so can be a good option storage heaters can provide a good constant background heat if you can get a cheap tariff. a hybrid combination of different heating types can work well too. get a heat loss calculation done on the property to see what is required first

https://shellystore.co.uk/product/shelly-pro-em-50a/ accuracy info if it worries you that much fit an old school meter.

I use a Shelly version, for power and another for flow/return/outside air nonissues 2+ years in

Ferroli Boiler is at leat 20years old! Bin the electric shower