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Hi, We've had an engineer come through who has recommended a JAB DUC to replace our existing cylinder. I've researched them online but haven't found much on them, nor any reviews. One of the main reasons he's recommended it over other brands is because the dimensions of the closet where it...

No, it's not zoned—we only have the one thermostat for the whole flat which is next to the cylinder on the ground floor. The only thing I'd done (which I'd mentioned above) was to try to replenish the air gap in the cylinder, but it was said that shouldn't affect the radiators.

Thanks you both for the help—oddly enough, the upstairs radiators have started working again and I've done nothing. Can they go on and off like this if there's air in the system?

Thanks for the info. We have some type of Main heat only boiler (part of the model info on it is scratched off but what I can see says “HE Plus”—can’t seem to find this model online anywhere). It doesn’t appear to have a pressure gauge. I’ve attached a photo of it. The two radiators do each...

Hi, We have two radiators on the second floor of our two story flat and our Megaflo CL170 unvented cylinder is on the first (ground) floor. For the past few days, we haven't been getting hot water to these radiators, but we have a bathroom on this floor and the sink and shower have been...