Heating system enclosure

An enclosure for a heating system for a service selected from the group consisting of receiving water through a water inlet port, recirculating water through a recirculation port, outputting a heated water supply through a water outlet port, receiving a gas supply through a gas inlet port, receiving an air supply through an air inlet port and outputting a combustion exhaust through an exhaust port, said enclosure comprising a wall through which at least one of the water inlet port, the water outlet port, the water recirculation port, the gas inlet port, the air inlet port and the exhaust port is disposed, said wall is configured to be removable for access to equipment disposed inside said enclosure, wherein the area around the service is accessible when said wall is removed, and the equipment is connected to at least one of the water inlet port, the water recirculation port, the water outlet port, the gas inlet port, the air inlet port and the exhaust port, wherein said wall comprises at least one door.