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Hot water vessel
A hot water vessel is used in production of domestic hot water.
Hydrogen sulphide
Hydrogen sulphide is a toxic and lethal gas produced in sewers and digesters under microbial anaerobic decomposition of organic matter.
Hydronics
Hydronics is the term describing the use of water as a heat-transfer medium in heating systems, and a cooling-transfer medium in cooling systems.
Hygienic designed manifold
Grundfos Hydro booster sets are not designed for the pumping of sterile liquids, but their construction and the choice of materials make them an ideal solution for secondary processes in hygienic applications such as pumping of potable water.
IEC efficiency standard
The International Electrotechnical Commission (the IEC) developed the IE energy efficiency standard in order to confront the problem of nations having different standards for energy efficiency.
Impeller
An impeller is a rotating iron or steel disc with vanes in a centrifugal pump.
Indirect system
An indirect system is a heating system where the heat emitters are not in direct connection with a boiler or district heating system.
Indoor temperature
Indoor temperature
Induced power
The difference between the power induced to the pump and the hydraulic power indicates the efficiency of the pump.
Infiltration
Infiltration describes the ingress of groundwater into a sewer system through faulty joints, damaged pipes, at manholes, etc.