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When changing a couple of radiators what would be the best approach to system cleaning? Products like X300 state not recommended for systems older than 6 months, but obviously the new radiators will have manufacturing oils etc, need passivation, and flux in system need flushing.

Resistive element is 100% efficient at point of use and has a power factor of 1. Except by adding an external heat source, ie a heat pump, those numbers cannot be bettered.

Bear in mind copper expands. Use a foam lagging that provides protection and provision for movement such as Armaflex class-O.

If you have needed to repressure the system periodically, maybe the expansion vessel membrane has failed and it's air has been transferring to the system water? And it's now out of charge so when heated the pressure rises.

It could also be low on water, meaning that there’s no water in the expansion vessel when cold. When heated the water expands a bit into the vessel, which should have between 1 and 2 bar in it, and hence it serves to stabilise the pressure accordingly.

That sounds like it’s working normally. The condensate is a result of burning the fuel efficiently.

By syphon do you mean the plastic condensate pipe to outside?

Anything that aerates the water is un-good. Likely there is a blockage near the pump (on the low pressure side, often where the cold feed from the tank joins the flow from the boiler). System probably needs cleaning and if it doesn't have one, a magnetic filter added.

Steeper fall might be better to prevent icing and it's not carrying solids.

Can be lined probably

Aqualisa Visage Gravity-Pumped Ceiling-Fed Single Outlet Satin Chrome Thermostatic Digital Shower | Showers | Screwfix.com

is it a double?

sounds like a 3-6kW ASHP might be the answer and a thermal store with multiple coils. You'll need bigger radiators. Shop around for wood. Yes £140 is what Certainly Wood will charge but local suppliers will be under half.

Yes, the stove needs to be lit. 12kW must be enough for 7 radiators unless they are gigantic. But cooling a 500l thermal store from say 80 to 40C releases only 24kWhr which clearly is only enough to provide 1kW for 24 hours, which is unlikely to be enough to adequately heat the house.

I'm not familar with wood systems but it sounds to me that it's simply not being used enough and not providing enough output. Could you just replace the wood stove with an ASHP and then install a log burner maybe.

RHI pays for ASHP based on consumption per EPC and the HP SCOP on the design flow temp. It's not limited to £5k (in England, anyway).

See (carefully) if what's coming out burns. If it does, it's hydrogen caused by corrosion which is indicative that there is a lot of oxygen in the system and not enough inhibitor. New steel will create gas as an oxide layer is formed on it... can take a number of months. If it's a low...

Can you get RHI for an ASHP in addition to claiming for whatever is left on the existing system?

I just replaced a plastic cold water tank installed in 1971. It was actually still apparently fine but had no lid.

The ducts also get restricted with dust over the years.