vaillant eco tec plus

25 May 2009
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United Kingdom
I had fitted about 5 years ago a Vaillant eco tec plus boiler in the downstairs utilty room.When the downstairs shower is running the boiler will not supply the upstairs boiler or even the kitchen tap with out effecting down stairs shower. it only appearscapable for running one shower at a time. Can anyone give me some advice on how to improve this?
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Is it a combi boiler, if so what size.

FYI - most combi boilers struggle to supply more than one HW outlet at a time, unless they have a large output, even then they aren't great

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