346 LIGHTING AND SANITARY EQUIPMENT 



steam, but it will cool off more quickly when the fires die 

 down. During extremely cold, windy weather, it is difficult 

 with a hot-air system to heat rooms on the side of a house 

 from which the wind is blowing. 



317. Steam and Hot- Water Systems. The steam- 

 heating system can be installed as a single-pipe or a two-pipe 

 system. The hot-water heating is a two-pipe system. The 

 two systems are quite similar as far as installation is con- 

 cerned, and can be installed fairly easily in a house already 

 built. The hot-water system works on the principle of water 

 being lighter when hot than when cold. The heated water 

 rises to the various radiators, the heat is given off in the 

 rooms, and the water at a lower temperature flows back to the 

 boiler. Care must be observed in installing the pipes to get 

 proper circulation. 



Most steam systems are for low-pressure steam. The 

 steam is generated in the boiler; it rises thru the pipes to the 

 radiators, where it loses its heat, and is condensed and flows 

 back to the boiler. In the one-pipe system, the condensed 

 steam flows back to the boiler thru the same pipe thru 

 which the live steam flows to the radiator. 



A house can be heated much more quickly with steam than 

 with hot water, but in a hot- water system the water will hold 

 the temperature more uniformly and a more even heat is 

 maintained. This is the big advantage of the hot-water sys- 

 tem over all other systems. 



The installation of most lighting and heating equipment 

 should be left to an experienced man. To install a pipeless 

 furnace, however, is not a very great task, and can be done by 

 a person with little experience. 



