. Principles and practice of plumbing . empty the practice it is quite usual to connectthe blow-off pipe direct to the drainagesystem, either to the kitchen sink trapor to the waste pipe below the sink is bad practice. When a buildingis closed for any great period of time, theboiler is usually drained of water and the ^. ,„„ • Ilg. 133 blow-off cock left open to carry off any safety vaiTcdrip from the pipes or boiler. That, provides a direct com-munication between the house drainage system and thewater supply system and possibly the living rooms. The best place to discharge
. Principles and practice of plumbing . empty the practice it is quite usual to connectthe blow-off pipe direct to the drainagesystem, either to the kitchen sink trapor to the waste pipe below the sink is bad practice. When a buildingis closed for any great period of time, theboiler is usually drained of water and the ^. ,„„ • Ilg. 133 blow-off cock left open to carry off any safety vaiTcdrip from the pipes or boiler. That, provides a direct com-munication between the house drainage system and thewater supply system and possibly the living rooms. The best place to discharge the water from the blow-off of a boiler is in a trapped and water-supplied sink whenthere is one at a lower level than the boiler blow-off. Whenthere is not, a compression hose bibb connected to a branchof the circulation pipe to the waterback will provide ameans of emptying the boiler through a hose or into blow-off cock should always be located at the lowestpart of the water heating apparatus, so it can be completely. Digitized by Microsoft® 300 Principles and Practice of Plumbing drained of water. If the waterback is located on one floorand the boiler at a higher level, then the blow-off cock wouldhave to be connected near the waterback. Double Heater Connections to Boilers.—Two ormore heaters are sometimes connected to one boiler. For instance, a coal or gas heateris sometimes used to heat thewater during summer months,and a steam coil used to heatthe water during winterweather. Each connectionwould be made independentlyof the other under such cir-cumstances, and either meansor both means could be usedtogether to heat the water. The real test of the effi-ciency of a double heater con-nection to a boiler is the abilityto heat with one or both heat-ers together. When two water-backs or heaters are connectedto the one hot water tank, byjoining the flow and returnpipe from both circuits, greatcare must be taken to connectthem in such a manner that thecurrent
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