Würth IVT LATENTO 500, Mounting Instruction

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7. Avoiding heat losses
You can operate the system as economic as possible also by avoiding heat-losses.
Aside from insulating all hot-water carrying pipes and fittings, there are further
measures possible to avoid heat-losses:
Circulation pipes will always cause heat-losses!
Planning the tap connections favourably, a one-family house can do without
circulation pipes.
In case circulation pipes should really be necessary, a circulation pump and a
circulation control unit should be installed. Using the circulation control, the cir-
culation pump will only be switched on if required (e.g. switch in the bathroom,
short opening of the hot water, etc.) and only when the temperature in the
pipelines has dropped below a defined value. In addition, the running time of
the circulation pump should be set to a very short time.
The pump operating as circulation pump should be as small as possible.
Heat-losses are caused through circulations too. By installing heat siphons
into all hot water pipes (DHW, heating and solar), the micro circulation
can be reduced.