vitodens 100-w gas boiler.. struggling

bkearns · 30-09-2012 11:21AM #1

I've recently moved into a 3 bed semi with a vitodens 100-w 26KW gas boiler and a 3 zone heating system (upstairs, downstairs and DHW). With 2 zones on, the boiler has no problem in heating, however when I turn on the upstairs zone, the boiler seem to struggle to keep the downstairs radiators warm. The bottom of these radiators would be lukewarm at best. Any ideas whats wrong ?

DGOBS · 30-09-2012 11:52AM

Possibly the system needs balancing.

JohnnieK · 30-09-2012 06:10PM

I would say most likely a balancing issue.

K.Flyer · 01-10-2012 09:43AM

Might also be your circulating pump is needing to be replaced.

shane0007 · 01-10-2012 05:50PM

Does the pipes for downstairs rads come up from the floors or out of the walls, i.e. a drop down system? Also what is the pump head, i.e. is it a 5m or 6m head pump?

JohnnieK · 01-10-2012 08:50PM

Is it a system boiler or regular boiler (system boiler would have the pump and expansion vessel inside).

cikearney · 12-10-2012 11:31AM

Vitodens 100whba/b are a system boiler, and an excelent boiler at that. this is most likely a balancing problem(just like everyone else said).

vitodens 100-w gas boiler.. struggling

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