Thanks for your replies.
When we have finished renovating the rest of the house. I'll call in the specialists or is this a job that a keen DIY'er can do themsleves?
We have a Baxi Bahama 100 in the new house we have just moved into. It heats the rads no problem. The issue we have is with the hot water.
If we want a bath we have to run the tap first at high pressure to ignite the boiler then at a very low pressure to ensure that hot water comes out. We...