- Handles:
- Faucet handles typically come in 3 styles: knob, lever, and cross. Some manufacturers allow a customer to mix and match components to create a custom handle.
- Handshower:
- Showerhead attached to the end of a flexible hose which the bather can hold during bathing or showering.
- Hanger:
- A device used to support pipes.
- Hard Water:
- Natural water containing impurities in various proportions. Traditional hardness is a measure of calcium or dissolved solids in a solution, measured in parts per million.
hard water generally ranges from 100 to 250 ppm.
- Hardness:
- The amount of dissolved minerals in water measured in grains per gallon (GPG). the most common minerals are calcium and magnesium.
- Hardness Leakage:
- The presence of a consistent concentration of hardness in the effluent from an ion exchange water softener, often due to high concentrations of hardness or
sodium in the water being treated.
- HBA:
- Home Builders Association.
- HC:
- Handicapped.
- HD:
- Head.
- Head(1):
- The pressure of water or steam in a closed system. It represents the differential in the gravitational force exerted by a liquid at two different depths.
- Head(2):
- Nautical slang term for toilet.
- Head Loss:
- The pressure of water as measured at a stated point, either in feet or in pounds per square inch (PSI).
- Heat Exchanger:
- A heat transfer system.
- Heat Sensors:
- Heat-triggered devices on sprinkler systems that release the flow of water.
- Heat Trap:
- Restriction of heat loss through water connections to a tank.
- Hermetic:
- Completely sealed, especially against the escape or entry of air.
- Hertz:
- A measure of frequency; one Hertz equals one cycle per second.
- Hex Key:
- Allen wrench.
- High Temperature Limit Stop:
- Valve mechanism that provides added safety by allowing you to pre-set a maximum hot water temperature.
- Hold Down:
- A type of pipe anchor consisting of a U-strap bolted at either end onto a horizontal plate.
- Hole Saw:
- A small, cylindrical attachment for a power drill consisting of a circular saw blade for cutting holes.
- Hollow-jet Valve:
- A valve having a closing member that moves upstream to shut off the flow. The hollow-jet valve discharges a hollow or annular jet dispersed over a wide area.
- Horizontal Branch:
- Lateral drain pipes that run from plumbing fixtures to the waste stack in a building or in the soil.
- Horizontal Run:
- The horizontal distance between the point where fluid enters a pipe and the point at which it leaves.
- Hose Bibb:
- Term used for sillcock.
- Hot Water Dispenser:
- Product which maintains a quantity of near-boiling water for instant use at any time.
- House Trap:
- U-shaped fitting with two adjacent cleanout plugs visible at floor level if main drain runs under floor.
- HP:
- Horsepower.
- HT:
- Hose Thread.
- Hub:
- Female or bell end of a fitting or pipe into which pipe or spigot fitting can be inserted.
- Hub & Spigot Piping:
- Gravity rated DWV or pressure pipe that has a bell-shaped section at one end and a straight section at the other. As lengths are assembled, the straight end
of one fits into the bell of the next.
- Hubless:
- Same as no-hub. Cast iron drainage pipe with neoprene gaskets and clamps.
- HVAC:
- Heating, Ventilation, and Air Conditioning.
- Hydration:
- The chemical combination of water into a substance.
- Hydraulic Pressure:
- Pressure that exists in a system containing non-compressible liquid.
- Hydrolysis:
- the reaction of a salt with water to form an acid and a base.
- Hydronic:
- System of forced hot water.
- Hydrojet:
- Cold inlet tube designed to reduce sediment build-up and increase efficiency in a water heater.
- Hydrostatic Pressure:
- Pressure exerted by or existing within a liquid at rest with respect to adjacent bodies.
- Hydrostatic Test:
- test using non compressible liquid under pressure at a level equal to or greater than the maximum pressure that will be utilized when in used, such as is steam boilers.
- Hydrous:
- Containing water, water of crystallization or hydration, as certain minerals or chemical compounds.
- Hydroxyl:
- The chemical group of ion which is neutral or positively charged.
- Hygroscopic:
- Attracting or absorbing moisture from the air changed or altered by this absorption.
- Hypochlorite:
- The OCL anion; calcium and sodium hypochlorite re commonly used as bleaches and disinfecting agents.
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