Check out our other boiler brands here. Plumbers, gasfitters and drainlayers who are self-employed also need business skills. For more information or to discuss your requirements, please. Rated thermal power max/min (hot water production). Are also known as conventional boilers they heat water rapidly in the pipes that run through the tank and send hot water out to taps as necessary. The fastest plumber in the east! thanks for your quick work, pat. If your property has been affected by sewage.