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Solar hot water in this country will never pay back. Not worth it.

Combi boiler will work fine provided there is gas. 30kW Keep the electric shower as a backup.

Probably only needs pumping up. Or you can add an external expansion vessel. Get someone else out they are ripping you off.

lpg cheapest to get up and running. 2 47kg bottle and a boiler and you are up and running. That would barely cover the cost of an oil tank.

30kW boiler is more than enough for a flat. Gives around 11 litres a minute of hot water.

lpg install is dirt cheap. 2 bottles 47kg bottles and a boiler coming in about 1200-1400 pounds installed for the boiler only. Job done. A little more expensive to run than a bulk tank.

Your house do as you like. The building police can't do anything. If you want radiators put radiators in.

20 radiators will need about 30 kW. Any little combi boiler will do it. You will need two central heating pumps to do the radiators as 20 is too much for one.

Had a Condensing Worcester Greenstar 15Ri boiler fitted by British Gas in Oct 13. ------- Bad choice install by hopeless company. ----------- It had a system water flush & power flush and a Spiro Trap MB3 installed. Though the Timer Programmer, Digital Thermostat and HW cylinder were not...

No circulations going on. You have a blockage.

Manually open the 2 port valves does that cure the problem. It the boiler keeps shutting down it sounds like no circulation going on. Perhaps pump has failed.

Unvented ACV cylinder it can heat as you use it. If this is a true barn conversion it may be that you don't have the water supply to run 4 on suites at once though so an accumulator tank might be advisable if you have good pressure say 2.5 bar.

Boiler mixture air oil mixture needs adjusting that is why it is sooting up.

No. In fact you can close the valve. There is the radiator in the hall to act as a by pass should all the trv's close.

The best answer to this is use an ACV cylinder. This is a tank in a tank and can take much higher heat input more than even some of the bigger boilers can supply. It will nearly always heat up faster than you can use it provided you boiler can keep up.

Turn the temperature on the boiler up until the radiators are getting hot. Simply don't pay the rent until a timer and wall thermostat is installed in the house to control boiler and temperature of house. There might be thermostatic valves on the radiators turn these down to 3 so they shut...

Sounds like they replaced two pumps to achieve nothing.

It would be unusual to have left the tanks connected. It is possible you have very poor water pressure and the big tank in the loft is supplying the hot water via the combi. Turn the combi off and then turn a hot tap on. See if the big tank in the loft starts filling. Is there a filling loop...

Fit an expansion vessel to the cold main pipe in the house. Sorted. Ensure you have a stop valve in the house that has a non return valve in or if not have a none return valve fitted after the stop valve.

Try running a separate mains connection from a wall socket and plug to remove the posibility of a electrical supply problem. If that doesn't cure it check for any problems on the pcb perhaps a blown fuse. Other than that it could be a faulty pcb.