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According to those pictures, I don't have a secondary pump and I do have a zone valve. But i cannot see a lever under the zone valve's black wire?

I will get the engineer to have a look at my Secondary Pump too, thanks Jamestaylor!

I think i may well have to admit defeat and get someone in to just have a look over it. Your advice has been absolutely top drawer and I really appreciate the time you have spent trying to help, particularly when i have to ask you what most are the things are that i am supposed to be seeing...

The only lever i can see Dan has 'IntaBall' written on it and it is coming off one of the pipes right near the bottom...

I didn't even see your first post, i was too busy running up and down the stairs following Dan's advice! Im sorry for not seeing it. Still not sure i particularly deserved that reaction though... Im a Management Consultant not a plumber/boiler engineer/Unvented Hotwater Cylinder Installer!

Right, i ran the water til it got cold and the metal skin was cold to touch. 28 mins later, the cylinder skin was hot to the touch and the bath ran about 4 inches (ran hot for about 3 mins) hot, then went cold again....

It's a 'Grant Vortex' Condensing oil boiler....

The maximum the dial on my boiler downstairs can be adjusted to is about 50%? The graphic above it gives the impression it should be able to adjust further, but i can't turn it anymore. Where is the safety discharge pipe? Is that the one on the right hand side of the cylinder quite near the...

Right, i have taken that panel off. Both the temperature controls on the cylinder say 60 degrees celsius..... The metal skin immediately next to those dials is very hot. Sadly, i have no accurate thermometer to hand. Incidently, the cylinder does heat from the boiler downstairs, not economy...

Hello Dan, Thanks for your reply. I am not technically gifted in any way shape or form and so the short answer to your questions are that i don't know! Im sorry! I also have no manual for this cylinder either, i have never seen one. I guess the builders forgot to give it to me when they sold me...

Hello All, I have been in my new build house for 20 months now with a 125 litre capacity Oso Unvented Hotwater Cylinder. I have never really noticed a problem with a lack of hot water when i have needed it, but in the last few weeks the amount of hot water available has seemed a bit of a...