System is a back boiler,pumped CH and gravity HW to a cylinder. Top pipe to cylinder coil gets hot but bottom one does not. heated water goes up vent pipe into header tank. We suspect some sort of blockage in the gravity circuit. We thought about using a chemical cleaner, but given that there appears to be no circulation and heated water is just going up the vent pipe we don't know how effective this would be. Does anyone have any suggestions or are we just going to have to strip it out in an effort to locate the problem? Thanks in anticipation.
HW problem
- Thread starter hilfe
- Start date
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Oooookay. If we strip the cylinder out and find a blockage other than sludge, i.e. limescale is there anything we can use to remove it. Does anyone know if the waterways on a back boiler are interlinked. could we add something to the heating side that would treat the hot water side? .Once again, TIA.
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Update.... Stripped out cylinder and flushed boiler pipe work. Eventually a lump of what appeared to be cement dropped out. Must have been in there from day one X amount of years ago. Anyway put everything back together and it works fine. Just thought I'd let everyone know.
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