. Hot water supply and kitchen boiler connections : a text book on the installation of hot water service in residences and other buildings and methods of connecting range boilers, steam and gas water heaters. ffect that the loopin the piping affords. Here are two columns of water of equalheight. That in the descending leg, starting from the top of theloop, is obviously the cooler and therefore the more dense andby the law of gravitation must fall to balance the other and lessdense column of which the water front forms a part. Thus thehot water is pushed up and around the loop and, becomingslig
. Hot water supply and kitchen boiler connections : a text book on the installation of hot water service in residences and other buildings and methods of connecting range boilers, steam and gas water heaters. ffect that the loopin the piping affords. Here are two columns of water of equalheight. That in the descending leg, starting from the top of theloop, is obviously the cooler and therefore the more dense andby the law of gravitation must fall to balance the other and lessdense column of which the water front forms a part. Thus thehot water is pushed up and around the loop and, becomingslightly cooler as it progresses, descends into the boiler. The results obtained in this system are not generally sosatisfactory as with the boiler on the same or a higher levelthan the heater, owing to the slower circulation. A safe rulefor the height the loop should be made reads, Twice the heightabove the water front that the boiler is below it.* Any extra ^ 46 VARIATIONS IN CONNECTIONS. 47 height over this will tend to increase the efficiency and hastenthe circulation. A point that is sometimes lost sight of in installing a boilerin this way is the danger of emptying the water front by siph- -Air Cock. Vacuum Vafves- Cold =€
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