circulating head

circulating head, circulating pressure

A measure of the pressure available in a hot-water supply system for circulating water around the convection circuit.
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The problem, as mentioned earlier, is that under high load conditions the primary system circulating head, which is never constant, becomes additive to the secondary system pump head turning the pump into a booster pump.
The pump is designed to provide only the circulating head within the secondary system and cannot become a booster pump.
Johns says the SpinBrush allows a person to brush his or her teeth as if using a manual brush, while receiving the added benefits of polishing and plaque removing-action from the battery-powered device's circulating head.
That combination, notes a spokesman for the company, allows an individual to brush his or her teeth as if using a manual brush, while receiving the added benefits of polishing and plaque removing-action from the battery-powered device's circulating head.
That combination, says the company, allows people to brush their teeth as if they were using manual brushes while receiving the added benefit of polishing and plaque removing-action from the circulating head.