Heating and plumbing supplies are available for retail sale in Lisbon. Plumbing is the arrangement of pipes and drains in an establishment, an arrangement which carries either water or waste water/sewage. Heating refers to centralized heating solutions. Both these systems need specialized supplies and equipment, which are available in Lisbon. Some of the supplies that may be needed include boilers, cylinders, electric fire systems and enclosures, bathroom accessories, taps, underfloor heating systems etc. They are manufactured by a number of companies, one or more of which are available in Lisbon. One can also buy sets of equipment, such as a complete shower set, or a bathroom suite set, and so on. It is important to buy quality supplies that come with a performance and safety warranty. Especially in the case of heating supplies, energy efficiency is also an important consideration.