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    Nasty yellowy brown stain in my hot water

    Hello, I have just had a new gas boiler installed (Vaillant ecoTec plus 428). This has been connected up to the old s-plan system and HW cylinder. However the hot water is now coming out with a nasty yellowish/brownish stain. I have drained the header tank and cylinder completely and...
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    Vaillant ecoTec plus 428 open vent - control system wiring

    Hello, Existing central heating/DHW system is an vented S-plan supplied by a clapped out gas boiler which is to be replaced. I am considering having it replaced with a Vaillant ecoTec plus 428 open vent boiler. I would like the existing programmer and S-plan wiring to be reused for the...
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