Buderus Siphon 145mm Lock Height V2 63043767

The Buderus 63043767 is a siphon with a 145 mm lock height, supplied as part of the V2 accessory range. It is used on Buderus GB312 V2 series gas condensing boilers, where the siphon forms part of the condensate drainage arrangement. The part number and lock height identify the correct variant for these appliances.

• Water collecting around the condensate trap or beneath the boiler where the siphon sits
• Gurgling or bubbling from the condensate route while the boiler is running
• The siphon no longer holds its water seal, allowing flue gases to pass into the condensate drain
• Sludge, debris or hardened condensate residue visible in the siphon body
• Boiler locking out or reporting a condensate-related fault that traces back to the siphon

• Confirm the boiler model on the data badge matches one of the GB312 V2 appliances listed above
• Check that the existing siphon is the 145 mm lock height variant, as other heights are not covered by this part
• Verify the V2 designation, since the accessory range differs between versions
• Have the Buderus part number 63043767 to hand when ordering