Converting to Mains Pressure Hot Water

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Morning All,

I have a gravity fed vented hot water and cold supply to the bath tub with the rest of the house on mains cold. Pipes are 22mm and flow rate 18 litres per minute. Central heating is gas.

Im considering convering the hot water to mains pressure but a few things cross my mind:

1) What are the advantages/disadvantages over using water pumps to boost pressure?

2) Anything that would stop me doing the prep so a GSR person could swap the boiler? To be clear, this is altering the heating pipes and decomissioning the vented hot water cylinder, NOT doing any gas work.

3) What system does solar heating use as I understand this needs a hot water tank.

Any thoughts and advice great. One of the drivers is the boiler is 25+ years old and with the cost of pumps, whether im better off converting, especially as I have easy access to the pipes.

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