I recently had my oil switched over to gas. During the switch the installer advised me that I could disconnect the shower from the water tank in the attic and connect it to the mains supply. He said this would improve the pressure in the shower however the plumbing was quite old and this could also cause leaks. I didn't want to risk ending up with an expensive leak so I said to leave it connected to the tank in the attic.
Since the gas has been installed the hot water pressure in the shower is unsteady. The cold comes through fine but the hot water keeps dropping in and out, making it really difficult to shower. I've spoken to the installer and he wants to charge me further to replace the temperature mixer in the shower. I'm very wary of this, as they were abit of a nightmare during the installation, and the shower had worked totally fine before.
It's a ground floor bathroom. Previously the hot water was being stored in a copper cylinder 1 floor above the bathroom and pressure was fine. Now the boiler is trying to drag water from a tank in the attic, 2 floors above bathroom, and heat it on the hoof, hence pressure dropping in and out.
Am I on the right lines with this? And that it was inappropriate to offer to keep the attic water tank connected at all? Or am I completely barking up the wrong tree and it's likely just a coincidence that the shower needs some separate work?
Any thoughts/advice would be really appreciated!