To lag or not to lag the hot pipe from the calorifier

One more job to add to the list (!) is to lag the pipe which takes the domestic hot water from the top of the calorifier.


The calorifier sits in the engine compartment, probably on the swim (but I'm not on board to verify this), and pokes through a cupboard in what I'm calling the "engine room" (is this the right description of the area one enters by opening the slide and the rear steel doors?).


The space above the slatted shelf over the calorifier would make a good airing cupboard. We've used it to keep bacon butties warm while steering! But the outlet pipe really should be lagged.

Or should it? The hot water has always - so far - felt hot enough. Perhaps there's enough waste heat while cruising to keep this cupboard nicely warm. Perhaps it should be unlagged while cruising and lagged when marina-bound!

Another thing for me to investigate - there's a lot about Jubilee I have yet to learn - is the plumbing of the central heating. The radiators are fed from a Webasto diesel heater which, I think, also supplies domestic hot water. Presumably the hot water output of the Webasto is pumped through a coil in the calorifier before passing through the radiator circuit. But I haven't seen it with my own eyes yet.

Visible in the top photo are (clockwise from the blue oil can): tiller arm; calorifier; timer for immersion heater; two RCD-protected mains sockets; header tank for central heating; electrics for Webasto; stop cock in hot water pipe.