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PCE
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DIFF Subgroup
F24H 1/43

helically or spirally coiled

Introduced: January 1980

Full Title

Full titles differ between systems:

IPC:

Water heaters, e.g. boilers, continuous-flow heaters or water-storage heaters > Water heaters other than continuous-flow or water-storage heaters, e.g. water heaters for central heating > with water tube or tubes > helically or spirally coiled

CPC:

Water heaters, e.g. boilers, continuous-flow heaters or water-storage heaters (steam boilers F22B) > Water heaters other than continuous-flow or water-storage heaters, e.g. water heaters for central heating > with water tube or tubes > helically or spirally coiled

No child classifications to compare. This is a leaf node in both IPC and CPC.