High power boilers power: 30, 36, 42, 48 kw/400v. A spokeswoman says: "there is no question there were problems with corro sion in the early years and when you get a bad reputation it tends to stick but you can't say a condensing boiler is any less reliable than a conventional one these days.". Business registered in england & wales. High pressure water jetting services. A boiler is a big decision if you.