We've just had a claret red Donard fitted - it's heating 15 rads as good as the oil - and hot water - roasting - the plumber that fitted it was so impressed by it, he's thinking of putting one in himself. Initial problem we had was that it was too powerful, and the water started gurgling in the back of it as it was heating it so fast, it was sending hot water back down into the back of it (we had the damper to 5 on the front) - plumber told us that when you have the range going, you must close all dampers and put the top damper to 'cooker' and this stops - especially if it's still warm from the night before as the water in the tank will be still hot. This we have been doing and it's going a dinger - got oven to 250 deg. using just wood. Put coal in it before going to bed and it's still red in the morning. We also have an olymberyl back boiler stove in sitting room which is independent to the range - this is also heating rads and water - perhaps it's an issue with the plumbing on some previous posts?? - so far, we can't complain but you do have to clean the donnard regularly.