Are you a customer or the owner/manager of the business you’d like to add? Restrictions may apply coupons can only be used once. For all your heating and cooling needs, call or contact us today! There are no items in your basket. What's the cost of replacing your boiler? System boilers - also known as sealed system - come with a water cylinder (which usually sits in an airing cupboard) and no water tank. It's the start of mini mse's half term in order to be the best daddy possible, im stopping work.