I just got my winter setup into production. I have 20 feet of 1/4" line sitting
on the surface of my wood stove. I am only trying to heat 40 gallons of water.
It took 1.5 DAYS for the water to go from 45F to 100F with this configuration.
To be fair, there is a baffle below the air ducts which redirects heat away from
the coils, but the bottom line is that the surface temperature would have to be
at least 200F, and its taken a long time to get only 1/2 way there.
I would recommend the tank. It will have a much larger surface area and hence
better heat transfer than 60 feet of 1/4" line.
I'm thinking of upgrading my outside woodburning water heater.
I am wondering if it would be better to heat the water in a 5gal. tank or
use 60' of 1/4in copper tubing running back and forth.
Either the tank or the tubing would be in a chamber above the burning wood.
Anybody have knowledge/experience in this area?