I have now had a chance to comment on the 25V UV filter I bought and plumbed in about 1 month ago. It was delivered on time and works well although I have not as yet got around to having my water supply tested. It does heat up overnight but not a problem if allowed to run for a few seconds before using. I was limited for room so had to fix it horizontally but again O.K. I used 300 mm long flexible connections so that the bulb is easily accessible for installing and changing when necessary. Ridged pipework would need careful planning. David Llewellyn Wales