7.8104.4 Pumps

Water Heating
Desired Outcome: 
Provide safe and reliable hot water that meets the needs of the occupant/buildingmanagement/building operations staff at the lowest possible life cycle cost
For supporting material, see Referenced Standards.
Hazardous material removal

Health concerns in the removal and replacement of equipment (e.g., asbestos, other hazardous materials) will be identified

Written notification will be provided to occupants of the discovery of hazardous material, including contact information for regional EPA EPA U.S. Environmental Protection Agency, www.epa.gov asbestos coordinator

Occupant will be asked to contract with an EPA EPA U.S. Environmental Protection Agency, www.epa.gov -certified asbestos contractor to conduct abatement before decommissioning and replacement (occupant is responsible for abatement or remediation)

Remediate health hazards using EPA EPA U.S. Environmental Protection Agency, www.epa.gov -certified contractors


Old pumps will be hydraulically isolated (valves shut) and drained before removal

Old pumps will be disconnected from electricity before removal

Safely remove the old pump

Installation and location

Pump will be installed and plumbed to allow for inspection, maintenance, and replacement of the pump

Ensure the pump can be easily maintained and replaced


Pumps will not be insulated

Prevent the pump from overheating


Valves will be installed to isolate pump from water heating system

Allow for easy removal and maintenance of the pump

Controls and sensors

Controls and sensors will be installed or reconnected in accordance with design specifications

Installer will understand the control system

When controls are using low voltage, the low voltage and line voltage wiring will be separated

Ensure proper function of the water heating system


Pressure gauges will be installed to measure suction, discharge, and pressure differential

Verify proper operation of the pump


Pumps will be mounted in accordance with manufacturer specifications

Prevent the pump from coming loose

Minimize vibration

Laminar flow

Pumps will be installed in accordance with manufacturer specifications with sufficient straight line piping before and after the pump

Minimize pump cavitation

Ensure proper operation of the pump


Damaged wiring will be replaced

Wiring will be protected from physical damage and water sources

Polarity of pump wiring will be verified before starting the pump

Prevent damage to the pump

Ensure pump is properly wired

Drain/purge valve

A drain spigot will be installed in close proximity of the discharge end of the pump

Allow the piping to be purged of air

Dissimilar metals

When connecting nonferrous metal pump to existing ferrous piping, a plastic-lined steel nipple a minimum of 4" long will be installed to connect the two piping systems

Minimize corrosion between dissimilar metals

Pump materials

Pump will be made with metals suitable for potable water, such as bronze or stainless steel

Ensure safe domestic water for building occupants

Stray voltage protection

Motors will be grounded per NEC NEC National Electrical Code ( NFPA NFPA National Fire Protection Association, www.nfpa.org 70)

Eliminate stray voltage


The following will be checked before energizing the pump:

  • System filled and purged
  • Safety controls present
  • Valves open
  • Pump and check valve properly oriented
  • Shipping bolts removed

The following will be checked once pump is energized:

  • System purge complete
  • Rotation
  • Function of safety controls
  • Integration of system controls
  • Water leaks
  • Operation of pressure gauges

Manufacturer specifications will be met in commissioning

Ensure the pump operates as designed