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England from the other shore

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Глоссарий технических терминов по водонагревателям (английский)

temperature rise(Delta "T") The number of degrees Fahrenheit (F) the incoming cold water must be raised to reach the desired hot water temperature.
recovery (gph)The amount of water in gallons that can be heated in one hour.
rated storage volumeQuantity of water (expressed in gallons) stored in a tank.
preheated waterWater that has been tempered for inlet supply to the water heater.
power ventingMechanical draft exhaust to outside, usually utilizing room air to support combustion.
point of use water heaterSmall water heater used for remote locations.
peak load periodThat period of the day when the system has the greatest demand.
peak hour demandTime when the largest demand for hot water is needed.
parallel systemTwo or more identical size heaters piped with water connections, that is cold water travels equal distance into the inlets of the heaters from a "T" connection and hot water travels equal distance fro...
oil poweredA water heater that uses oil as its fuel source.
ohm1) A unit of electrical resistance.
2) The unit of resistance. The electrical resistance between two points of a conductor where
3) the unit of resistance. the electrical resistance between two ...

residentialWater heaters for single family dwellings.
return circulation systemTempered water from or near the point of usage which eliminates waste of hot water used for long runs and adds storage to the system.
reverse flowAnother method of manifolding water heaters together in order to limit the unbalanced pressures in a multiple heater installation.
tankless water heaterCommonly known as instantaneous or point-of-use water heaters.
standing pilotA small burner used to ignite the main burner.
stand by lossThe amount of heat lost while unit is in stand by mode.
spark ignition1) Intermittent ignition device that utilizes a spark to light a burner flame.
2) воспламенение [электрическое зажигание] запальной свечой

solenoid1) A coil of wire in the form of a cylinder that carries a current; resembles a bar magnet.
2) соленоид, электромагнит

sliding inner doorA door slides along combustion chamber radius for easy access to the burner and pilot.
sight holeGenerally referring to oil-powered product that allows the viewing of burner and flame patterns.
series systemGenerally where the primary heater preheats water to a given desired general purpose temperature and feeds into another heater.
sealed combustionSealing of combustion chamber to prevent spillage of combustion products.
safety shut off valveA device on a gas appliance which shuts off the gas supply to prevent a hazardous situation. A flame failure safety shut off operates when the actuating flame becomes extinguished. A 100% shut off cut...
net usable btuThat portion of a fuel’s heat energy actually transferred into the water by the heater.
manifolded installationParallel or reverse flow plumbing of water heaters for large hot water demand applications.
light duty (ld)Small demand commercial applications.
foot printThe area of space taken up by the water heater.
foam insulationThe insulation surrounding the surface of the water heater tank.
first hour delivery (rating)Combination of the usable stored volume of hot water in tank, plus the recovery capacity for the first hour of operation.
dual element heaterAn electric water heater with an upper and lower element for heating water.
degree riseDifference (Delta "T") between the starting water temperature and the ending temperature after heating is complete.
conventional ventingAtmospheric venting that utilizes the natural convective rise of hot flue gases through the system to release the products of combustion.
commercial applicationDemand for more water usage than in a single family dwelling.
combustion gasesGases released when a gaseous, liquid or solid fuel reacts at an elevated level that needs to be vented with gas or oil-fired water heaters.
check valve1) Allows fluid to flow in only one direction in a pipe; also known as back-flow preventer.
2) возвратный клапан
3) обратный клапан

chkv; ckvlv; cv; обратный клапан;
atmospheric combustionCombustion takes place when gaseous, liquid or solid fuels react at an elevated temperature with oxygen by burning, thus releasing heat in an open combustion system.
fvirFlammable Vapor Ignition Resistant.
galvanic actionIf two unlike metals are immersed in an electrolyte, an electrical potential will exist between them; if the two are in electrical contact, an electrical current will flow; the metal which becomes the...
gama1) Gas Appliance Manufacturers Association. Now called AHRI (Air-Conditioning, Heating and Refrigeration Institute).
2) general aviation manufacturers association

general aviation manufacturers association;
life cycle labsA place where water heaters are tested at an accelerated rate to simulate life expectancies.
laminar flow1) Streamline flow in a fluid near a solid boundary.
2) A flow situation in which fluid moves in parallel lamina or layers.
3) ламинарный поток

kw - kilowattA measure of the rate of supply of energy or power, and is equal to 1000 watts or 3412 BTU`s per hour.
jetportReferring to the Hydrojet dip tube. Creates turbulence in the tank.
instantaneous water heaterA type of water heater that heats water as it flows through a heat exchanger coil.
incoming (inlet) temperatureTemperature of water entering tank.
immersionReferring to something submerged in water.
heat trapRestricts heat loss through water connections to a tank.
head lossThe pressure of water as measured at a stated point; it may be measured in feet or in pounds per square inch (PSI).
gas controlDevice used to regulate gas pressure on a water heater.