I don't understand much on how the plumbing appliances work kurt explained the appliances to me! i highly recommend him for your plumbing and heating needs! Your account, who has to pay, banding, how it's calculated, discounts & exemptions, how we spend it. Great service, fast and efficient!! highly recommended!! Most oil boilers use kerosene as a fuel and are floor standing like their gas counterparts, they also come in both combi and heat-only condensing styles. Our handy.