Domestic Hot Water System Crossword Puzzle

QUESTIONS LIST:

• instantaneous : a system that heats water when the outlet opens
• feed and expansion : cistern that feeds the primary circuit in a open vent system
• prv : a device used to control mains pressure in a unvented system
• vent pipe : the pipe allowing for expansion and acts as a safety relief
• heat exchanger : a coil inside a indirect cylinder.
• unvented : a system operating at mains pressure without a cwsc
• blending valve : a valve limiting bath water temperature to 48 degrees
• gravity fed : a shower relying an head pressure form a cwsc
• direct : a hot water cylinder with no heat exchanger
• pump : a pump primary system uses one of these
• check valve : a valve preventing back flow
• air gap : space between a tap and the rim of a sink
• expansion vessel : a device that compensates for the extra volume when water is heated