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It does make a difference. For a 150mm (6”) fan the gap needs to be 177cm2 minimum.

For a 10cm (4”) fan the gap under the door needs to be minimum of 78cm2.

My mistake, further investigations reveal that on the Greenstar there is no manual procedure on the diverted valve and the boiler relies on an automatic air purge mode.

According to online sources the diverter valve can be placed in "manual" mode which would allow the trapped air to be released. Edited…….

That’s not heating though. You asked about controlling heating for dawn/dusk.

Wiser allows more than 9 thermostats, you can have up to 16 heating zones/rooms with maximum of 5 devices in a zone but a maximum of 64 devices in total.

It’s an unusual thing to want to control heating based on dawn and/or dusk so you will have to lash up a way to do it using something like Home Assistant and a 3rd party sensor. The HA integration for Wiser is excellent and gives a huge amount of information and control which the Wiser app can...

FTTP is Fibre To The Premises

From your first paragraph it looks like you agree with me. If you use the “smart” TRV’s manually then why not just use mechanical TRV’s and save on batteries.

I wouldn’t go as far as a half turn, I did mine on an 1/8th turn first and then turned each lockshield another 1/8th turn until all rads got hot.

I think people buy mechanical TRV's because they don't need an app, dont need batteries, rarely go wrong and are generally cheaper for a good quality TRV rather than pay cheap for a poor quality electronic TRV. I dont see the point of a "smart" TRV that cant control the heat source, you may as...

As a landlord then surely your boss is not legally allowed to deduct anything directly from your salary unless it pertains to your employment. You are right to gather all the information and evidence regarding the poor maintenance which is the landlords responsibility, I would also give him a...

5.5kW for one room is crazy, my whole 4 bed house is only a bit more than that! You could go with the DT40 radiators and run a suitable flow temp as required. Then fix the building insulation issues, especially the loft insulation as it’s a quick and cheap fix, then gradually lower the flow temp.

What is the heat loss of your property? I can't believe it is 22kW more likely to be around 8-10kW. A combi boiler in a 5 bedroom house with 4 bathrooms is less than ideal. As @gas112 has said swapping 15mm copper for 15mm hep is going to add some restriction to the flow.

Size the radiators for a DT30 rather than DT50

Did you open the lockshield valves fully? If so turn all the upstairs radiator lockshields to be open a 1/4 turn from closed.

Shelly have a number of sensors that can be used with their switches. Off the top of my head they have motion, temperature, humidity, door/window and light sensors that can all be integrated with Alexa.

Have a watch of this, it explains it all very clearly

The average UK home needs 6-8kW so yes the vast majority of system and heatonly boilers in the UK are massively oversized.

That looks like an old Hive controller.