Hot Water Temperature Maintenance

Builders of residential apartments, condominiums and single-family homes need a way to provide domestic hot water at the tap without long waits or wasting water.

Hot Water Temperature Maintenance Heat Trace System

HWAT-Residential.jpg nVent Thermal Management has a residential domestic hot water temperature maintenance (HWAT) system that provides immediate hot water at the tap. The HWAT system:

  • Maintains residential domestic hot water at approximately 125°F
  • Is installed directly on the supply piping
  • Can be run as close to the fixture as required, reducing the waiting time for hot water
  • Dramatically cuts the “time-to-tap” for hot water at low-flow fixtures

The nVent RAYCHEM hot water temperature maintenance (HWAT) system consists of:

  • Electric heat trace cables — the RAYCHEM heat trace cables adjust their power output along the entire length of the pipe to compensate for variations in water temperature and ambient temperature
  • Connection kits and accessories — items for making electrical connections and properly completing the installation, such as the RayClic power connection, tee, splice, and end-seal kits
Instant Hot Water, Minimal Waste

19_HWAT_rs_thumbnail.jpg When you compare pipes with and without HWAT, HWAT significantly improves temperature maintenance at the tap by compensating for heat loss in the supply pipe.  You will also find that there is a large reduction in wasted water.


Simple Design, Lower Cost

nVent RAYCHEM HWAT-P1 temperature maintenance heat trace cable can be cut to length in the field, and tees can be used to accommodate pipe branches. Plumbers and electricians can install our innovative RayClic connection kits in a fraction of the time required for terminal block or crimp-type connections—thus dramatically lowering the total installed cost of the system.


Complies with ASPE water delivery times and non-circulated pipe length requirements.

ASPE requires that hot water is delivered within 30 seconds and that non-circulated hot water supply pipes not exceed 50 feet. This is only possible for high flow fixtures, not today's low flow fixtures at 0.5 gallons per minute. HWAT-P1 temperature maintenance heat trace cable can be installed all the way to the tap to meet these ASPE delivery time requirements.

Self-Regulating Technology

nVent RAYCHEM HWAT self-regulating electric heat trace cables automatically adjust their power output to compensate for temperature changes. Heat is generated as electric current passes through the conductive polymer core between the conductors. As the temperature drops, the number of electrical paths through the core increases and more heat is produced. Conversely, as the temperature rises, the core has fewer electrical paths and less heat is produced.

RAYCHEM HWAT-P1 self-regulating heat trace cables:

Self regulating

  • Have a cross-linked, conductive polymer core forming a parallel circuit
  • Have a self-regulating core that limits the maximum temperature that the heat trace cables will maintain, making them compatible with both metal and plastic hot water distribution pipes
  • Are designed to maintain residential hot water distribution piping at approximately 125°F
  • Are protected by a tinned-copper braid encased in a durable outer jacket to withstand mechanical abuse during installation
  • Feature an aluminum barrier to protect the heating cable from plasticizers which diffuse from commonly used closed cell foam insulation

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