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Frequently Asked Questions
Why does a hot water loop need regulating?
Because its branches lose heat unequally.
Length, insulation and draw-off all differ.
Flow takes the easiest path.
Short branches over-circulate.
Long ones go cold at the far end.
What is wrong with a branch going cold?
Two things, and one is serious.
Taps run cold until the water arrives.
And the branch sits below temperature.
Which is a Legionella risk.
It is a safety matter, not just comfort.
How does the regulator respond?
By throttling on temperature.
A thermostatic element closes as it heats.
So a too-hot return is restricted.
Pushing flow to the branches that need it.
A cold return is opened up instead.
Why control on temperature rather than flow?
Because temperature is what is maintained.
Flow is only a means to it.
A branch balanced by flow can still be cold.
If its losses are higher than assumed.
Controlling the outcome is more direct.
What is the disinfection function?
It opens fully above a set point.
So a hot disinfection cycle passes through.
Rather than being throttled back.
Every branch then reaches temperature.
Which is the point of running one.
Who should set the set point?
Whoever owns the water safety plan.
It is a design decision.
Not a site adjustment for comfort.
Changing it changes the risk position.
Record it where it can be found again.
Where is the same device listed as a balancing valve?
Under Throttling Valves, with the balancing valves.
As Thermal Balancing Valves for Hot Water Recirculation.
Same device, different duty emphasised.
Look there if you are commissioning a loop.
Look here if you are specifying a temperature.