Water Hammer / Arrestor

Related terms

• Water Pressure / PRV

  Household pressure (ideally ~50–70 psi). A pressure-reducing valve protects fixtures where street pressure is too high.

• Vent Stack

  The piping admitting air so drains flow without siphoning traps, terminating through the roof. Adding fixtures often means new venting.

• Water Service Line

  The pipe from the municipal main or well to the house. Old galvanized or lead service lines are often replaced during major remodels.

• Variable-Speed Blower

  An ECM blower that ramps output to match demand for steadier temperatures, better humidity control, and lower electricity use than single…

• Water Softener

  Equipment that removes hardness minerals to protect pipes, fixtures, and water heaters. Often added during a plumbing remodel.

• UEF (Uniform Energy Factor)

  The standardized water-heater efficiency metric for comparing models; higher UEF means less energy per gallon delivered.

• Whole-House Filtration

  Point-of-entry treatment (sediment/carbon) for all household water, plumbed at the service entrance.

• Two-Stage / Modulating

  Equipment that runs at partial capacity most of the time for efficiency and comfort, ramping up only on extreme days.