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circulation problems

  1. G

    Boiler problems in big house - Change required?

    Let me first list the set-up we have: Vaillant ecoTec Plus 637 system boiler Zilmet unvented hot water cylinder with external expansion vessel 1 zone valve for Central Heating 1 zone valve for hot water cylinder 1 Grundfos 15-50/60 circulation pump (on flow pipe from boiler) 16 radiators...
    • Goku
    • Thread
    • bigger pump boiler wiring circulation problems grundfos powerflush relay box relay wiring thermostat trapped air vaillant
    • Replies: 30
    • Forum: Plumbing and Central Heating
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