here is something i was playing with today for a 2nd boka i am building
2' inch pipe about 200mm long, 3/8 coil about 220mm long
when it winds it flattens out a bit but does not restrict the flow much
the connectors are a bunnings hose joiner cut in half for "click" fittings the 3/8th fits perfect :D
i hate 1/4 in coils as i find the water flow restrictive using the pumps i have. but 1/4 coils work very well
Thought this might make a interesting change.
i have another 1/4 coil that comes back up the middle and it can knock down 2200w easy
i tried it tonight on just water steam and it needs a scrubber in it to prevent steam escaping.
once the scrubber was jammed in no problems knocking down 2200W