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Yeah, i thought that was going to be the answer. Thanks for replying Tony. Just to confirm, from my original post, would you suspect the HEX is blocked, choked etc - there's nothing else I should try first?

Hi all I'm having a problem with my Vaillant Turbomax VUW GB 242/2-5 which seems to be a common problem but I'm unable to find an answer to my specific problem. The problem is the DHW doesn't get very hot. The CH is fine and heats perfectly. I have measured the DHW temperature and it's...

is there anyway I can increase the flow by installing an inline pump?

ok thank you for your help - guess I'll have to send them back...

would getting a full bore isolation valve help?

not sure - recommended pressure is 1 - 5 bar though if that helps....

I would appreciate any help/advice someone could give me on this problem which has me scratching my head. I recently moved into a house with an open vent ch system and gravity hot water - not sure thats relevent but.... I had very poor flow from the hot water tap in the kitchen - the...