Install Instructions

Fastening the Viega PureFlow System
71 of 88
IM-PF 724596 1021 PureFlow Water System (EN)
12.11 Domestic Hot Water Circulating Systems
A hot water circulation system can be incorporated into most plumbing
systems and works by constantly (or periodically throughout the day on
a timer) circulating hot water through the main hot supply line of your
plumbing system.
This is done by using a return line at the end of the main hot supply line,
and a low-󶈶ow pump (usually near the hot water tank). The circulating
system keeps hot water readily available throughout the main hot water
supply line, eliminating the need to purge the entire line before hot water
is present at the 󶈵xture.
There are hot water circulation systems available in the marketplace that
o󶈴er a variety of options. These systems are ideal for branch-and-main or
combination systems with spread-out 󶈵xture groups/󶈶oor plans, as well
as for larger homes using multiple ManaBlocs in a parallel-type system.
Typical domestic hot water circulation piping
Hot return
To 󶈵xture To 󶈵xture
Hot water supply
Hot
Cold
Hot water supply
Circ pump
Check valves
Cold supply to W/H
Water heater