Viessmann Vitopend 100-W Installation And Service Instructions Manual page 45

Function description
DHW heating
(cont.)
Gas combi boiler
If the flow switch recognises that DHW is
drawn off (> 3 l/min), the burner and cir-
culation pump are switched ON and the
three-way valve changes over to DHW
heating.
The burner modulates to reach the DHW
outlet temperature and is limited on the
boiler side by the temperature limiter
(84 °C).
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