Got a problem with hot water on my boilermate 2 system, when using hot water, firstly it comes out okay for about 10sec, the it splutters and then water trickles out, takes about an hour to run the bath, and the water is scortching hot. Sounds like it needs a descale to me?? theres also a mixer valve on the side of the boilermate2 (not sure of the correct name for this valve?) this is all corroded up and leaking and could be contributing to the problem. Despite me trying to get a heating engineer no one actually seems interested!!. So is it something I can do my self? Im an electrician by trade with some plumbing knowledge. I think you can rent out descalers is that correct?? Any help would be welcomed. Cheers