7.8102.8 Heat Pump Water Heater

Topic: 
Water Heating
Subtopic: 
Installation and Replacement
Desired Outcome: 
Provide a safe and reliable hot water source that meets the needs of the occupant/building management/building operations staff at the lowest possible life cycle cost
For supporting material, see Referenced Standards and Building America Solution Center.
TitleSpecification(s)Objective(s)
7.8102.8a
Hazardous material removal

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

Upon the discovery of hazardous material, written notification and contact information for regional EPA EPA U.S. Environmental Protection Agency, www.epa.gov asbestos coordinator will be provided to appropriate people (e.g., occupant/building operations staff/property manager)

Property manager 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 (property manager is responsible for abatement or remediation)

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

7.8102.8b
Decommissioning

Decommission the applicable system components by completing the following in accordance with accepted industry procedures and practices:

  • Remove old water heater and associated components
  • Seal any unused chimney openings
  • Safely disconnect and secure any abandoned utility (fuel and electric) connections at source

Ensure the health and safety of the worker/occupant/building management/building operations staff

Preserve the integrity of the building and services

Remove old equipment in a timely and efficient manner

7.8102.8c
Equipment accessibility

A level working space not less than 30" in length and 30" in width shall be provided in front of the control side to service an appliance

Water heaters shall be installed in accordance with their listings and the manufacturer's installation instructions

Appliance will be installed and plumbed to allow for inspection, maintenance, and replacement of the appliance and its components, without disturbing any installed equipment, controls, piping, and components, other than what requires repair/replacement

Anode rod will be accessible for replacement

Ensure the appliance can be easily maintained and replaced

7.8102.8d
Equipment location

Appliance will be located to minimize noise impact

Appliance will be located to maximize efficient operation and auxiliary benefits (e.g., dehumidification)

Maximize operation of the appliance with minimal negative impact on building management/building operations staff

7.8102.8e
New equipment installation

A new water heater and associated components will be installed in accordance with local codes, accepted industry standards and practices, and manufacturer specifications

In instances where conflicts occur between the code and the manufacturer's installation instructions, the more restrictive provisions shall apply

In instances where a leak could cause damage, a drain pan will be installed under the storage tank in accordance with manufacturer specifications and the following criteria:

  • Connected to 3/4" drain line or larger to tapping on pan
  • Run to drain, pump, or daylight

Ensure the health and safety of the worker/occupant/building management/building operations staff

7.8102.8f
Drain pan

In instances where a leak could cause damage, a drain pan will be installed in accordance with manufacturer specifications and the following criteria (Uniform Plumbing Code 5.10.7, IRC IRC International Residential Code 20801.5.1):

  • Connected to 3/4" drain line or larger to tapping on pan
  • Run to drain, pump, or daylight

Collect and safely dispose of water escaping from the appliance

7.8102.8g
Temperature and pressure relief valve

Correct temperature and pressure relief valve will be installed in accordance with manufacturer specifications

Equipment will be connected to properly sized discharge tube and run to a safe location no greater than 6" from the floor or as prescribed by local code (in the absence of local code, as prescribed by UPC)

There will be no shut off valve installed on the discharge tube

Safely discharge excessive energy (pressure or temperature) from the appliance to a safe location

7.8102.8h
Dielectric unions (dielectric insulator)

Dielectric unions (dielectric insulator), if needed, will be installed in accordance with manufacturer specifications

Minimize corrosion between dissimilar metals

7.8102.8i
Stray voltage protection

Electric water heating equipment should be installed per the NEC NEC National Electrical Code (NFPA70)

Break the stray voltage electrical circuit through the appliance

7.8102.8j
Backflow prevention

Backflow prevention will be installed in accordance with manufacturer specifications and all applicable codes

Backflow devices shall be tested by a certified backflow assembly tester at the time of installation, repair, or relocation, and not less than on an annual schedule or more often where required by local code

Protect the water supply from contamination

7.8102.8k
Pressure verification

Water pressure and volume capacity of the building will be verified as sufficient to be in accordance with manufacturer specifications

A pressure regulator or booster pump will be installed as required

Provide proper water pressure to the appliance

7.8102.8l
Pipe insulation

All piping and fittings will be insulated with fixed insulation to IECC IECC International Energy Conservation Code or ASHRAE ASHRAE American Society of Heating, Refrigerating and Air-Conditioning Engineers, www.ashrae.org 90.1, at a minimum

Reduce line losses

7.8102.8m
Required air

Ventilation and clearances for adequate heat transfer will be provided in accordance with manufacturer specifications

Ensure adequate air for heat exchange across the coil

7.8102.8n
Electric supply

Electric supply components will be installed to accepted industry standards and codes in accordance with NEC NEC National Electrical Code (NFPA70)

Energy input required by the appliance will be in accordance with manufacturer specifications

Provide sufficient electricity to the water heater

7.8102.8o
Discharge water temperature

Discharge water temperature will be set not to exceed 120 °F or as prescribed by local code

Install mixing valve when higher storage/generation temperatures are required

Ensure water temperature is low enough to prevent scalding

Ensure water temperature is high enough to inhibit growth of pathogens (e.g., Legionella, etc.)

7.8102.8p
Commissioning of system

The following will be checked once the system has been connected and filled:

  • Safety controls
  • Operational controls
  • Water leaks
  • Cycle unit through modes
  • Filter
  • Other system components (e.g., expansion tank, storage tank)
  • Temperature set point

Manufacturer specifications and all relevant industry standards will be met in commissioning

Ensure the system functions as designed with the lowest possible cost of ownership

7.8102.8q
Education

Completed work will be reviewed

Occupant/building operations staff/property manager will be educated on the safe and efficient operation and maintenance of the system, including:

  • Adjustment of water temperature
  • Operation of backflow preventer and pressure regulator
  • Filter replacemen
  • Importance of keeping operating manuals accessible

Educate the occupant/building operations staff/property manager about the safe, efficient operation and maintenance of the system