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I assume you can get a free biomass boiler for a new build. Just had my biomass installed for free. :-)

I would try to minimise any joins in an inaccessible place. 20 joints is just frightening. I would only consider using copper bent and soldered to minimise joints in an area like this.

Toyo seem to be in japan/china. Ebay doesnt seem to have them.

Where could I get a replacement pcb for a Toyo Electric Air Con unit I bought off ebay a few years ago?

www.nws.co.uk or a shade greener the same people who did the free solar panels. Get a free biomass boiler, 7 years free servicing and breakdown. A shed to put it in all for nothing. House has to be a certain size but nothing too huge.

Sounds like in both instances the plate heat exchange is partially blocked. Drain the central heating system first and refill a couple of times to clear existing dirt out of the system. Then remove plate heat exchanger on boiler and flush through with brick acid. This should hopefully...

Height shouldn't usually be a problem. Ensure you have a sealed system. Don't mess about with open vented systems. But why pay for it when you can get a free biomass boiler. :-) Just had mine installed. :-)

One 35kW boiler is going to be plenty. If you go for a biomass boiler it is free!!!

An unvented cylinder or heating system isn't suitable for an uncontrolled solid fuel system.

+1 Minging buy a new one and stop messing.

The diode is a flame sensor it detects the light of the flame. It is used before the control unit starts the ignition sequence to see there is no flame and then again after the oil has been switched on to ensure a flame has been established. Any fault on either signal and the burner will...

4 showers each taking 10 litres a minute for 10 mnutes requires about 400 litres of water. About 2/3 of which is hot so 300 litres should do it. acv tank is just tank within a tank it gives a much bigger surface area therfore heats much quicker.

Go for a tank from acv. Tank in a tank they have amazing reheat times only limited by how fast you can supply the heat. You can therefore have a smaller tank provided the boiler can keep up.

If the burner is lighting and you hear the bang. It comes down to dirt on photo cell. Or photo cell fault not detecting the light. Or pump solenoid valve/solenoid cutting the fuel off.

No you pay for install of the tank. YOu can then transfer to another supplier. I assume there is some payments going on between the suppliers behind the scenes to cover costs of tank.

Nothing stopping you having both since you have both boilers just connect them both up to the same system. My preference is an lpg system boiler and unvented cylinder or oil boiler with unvented cylinder. Both will be more reliable than combi and give better water delivery.

Old and new don't mix well. Or if they do it's expensive and never worth it. Either old fashioned or new the choice is yours.

They are giving away wood pellet boilers at the moment. Get it finished quick and then get one installed for free. :-) I would go with a passive house then you don't need any heating.

There shouldn't be any problem.

0.55 60 S,H,EH,ES 0.55 is the US gallons per hour 60 is the angle of spray from the nozzle. How much is spreads out. S,H,EH,ES refer to the spray pattern. S solid, H hollow (empty cone spray pattern. ES and EH are variations on the solid and hollow. so a 0.75 80 EH would be 0.75...