Trace heating provides compliance with CIBSE Guide G
Raychem HWAT self-regulating electric trace-heating cable is said to meet all the recommendations in the new ‘CIBSE Guide G: Public health and plumbing engineering’. The guide recommends that secondary circulation or trace heating should be provided when the hot-water installation is such that its would take an unreasonable length to draw off the cool water from the pipework.
HWAT enables hot water to be delivered to taps, showers etc. using a single-pipe system, without the need for recirculation. HWAT also avoids deadlegs where the water temperature can fall to ideal levels for legionella to thrive.
There are other benefits of HWAT, such as no need for a recirculation with pumps operating continuously.