[Stingo]

Hmm. My Volkera required topping up every other day a while back. The indications that this was required was the falling pressure. A plumber we new fixed it on two previous occasions but wrapped his hand in on the third...mainly because Volkera's are a **** to work on. SO we got one of them service contracts with British gas, waited a month or so and then let them know about the defect - which the nice man sorted. When we took out the contract, there was a six or so week gap from then until they did the first visit to establish a datum...hence we were quite lucky and didn't have to fork out extra cash. I just check the pressure monthly now and top it up as required. It's a combi, nothing wrong with that but it is not a very good make. We might go for something more'ozone friendly' when we need to replace it.