8 to 11 kW. Banish that clunky old boiler. You’ve put up with it for too long. Instead, add a wrap-around or clip-on boiler to your Herald 8, and this family-sized stove will run your heating system. It will supply you with hot showers, flickering flames, and warm radiators. Which system is right for you? Use the links below to explore the possibilities. Then ditch the boiler for good.