Inspect Before You Buy by Charlie Rose

Author:Charlie Rose
Language: eng
Format: epub
Publisher: Atlantic publishing Group, Inc
Published: 2007-06-15T00:00:00+00:00

DISTRIBUTION PIPING

There are three basic types of distribution piping: one-pipe, two-pipe, and series loop. The system that is used depends on the size of the house.

The one-pipe system has one pipe that leaves the boiler and travels throughout the house and then back to the boiler. It serves as both the supply pipe and the return pipe. Each radiator in the house is connected to two risers at each end that are connected to the one-pipe system. A shutoff valve on the riser allows water to flow into the radiator. This way a radiator can be shut off without affecting other radiators farther down the line. The farther the radiators are from the boiler, the cooler the water that reaches them. As a result, these radiators have to be larger so that they produce the same amount of heat.

The two-pipe system is the most costly to install. As the name suggests, there are two pipes that are used for this system. One pipe is used to supply the heated water and the other is used to return the water to the boiler. This allows even heating throughout homes because the cool water going back to the boiler never mixes with the hot water going to the boiler. While it is relatively costly to install this system, it is often worth it because of the quality of the heat it provides.

The series loop system is the least expensive and easiest system to install. Heated water flows from the boiler and throughout the house in one pipe. It enters each radiator, usually a baseboard convector, goes through radiators one by one. Therefore, if the supply is stopped at one radiator, it cannot continue on to any of the other radiators. This type of system is used in smaller homes. In a larger home, the system is usually divided into multiple heating zones so that each zone will have a different set of supply pipes. Each zone will also either have its own circulating pump or its own valve that is controlled by a thermostat in the main supply pipe.

The supply pipes do not always run to a radiator. A forced hot water system could also supply heat through distribution piping imbedded in the floor, walls, or ceilings. These areas are known as heating panels and they serve the same purpose as radiators. The heat from the pipes is transferred to the panels and the panels heat the room through radiation and convection. This type of system heats rooms evenly and is most effective when the house has no basement.

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