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Half Bathroom:
United States terminology for a separate room containing only a toilet and a sink. Sometimes referred to as a powder room or guest bath.


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 & 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:
Chemical compound containing chlorine in oxidation state. The OCL anion; calcium and sodium hypochlorite are commonly used as bleaches and disinfecting agents.


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