In the sketch, A indicates the bath tap, B that for the lavatory, and C that for the scullery. The sketch shows a well designed and proportioned apparatus on the cylinder-tank system. The boiler (dome-top kind) should be a No. 3. A smaller size would do, but small boilers do not take a sufficient charge of fuel, and they therefore need more frequent feeding and attention than large boilers. If hard water is used, the boiler should have the water-way carried below the fire-bars, and be provided with cleaning holes and lids.

Cylinder-tank System Hot-water Supply.