Thanks for all the responses.
most people that try adding a coil for hot water end up being disapointed with the results.
you would be better off looking for a deal on a used coal boiler,
with #2 heating oil at $2.23/gal there is a good chance you will find one.
here is a link to boilers for saleFurnaces, HVAC, Plumbing Supplies-4Sale
Well that is a good idea but I have a direct vent keystoker ... so no chimney ..
ceccil wrote:Bug512, I don't know if anyone else has tried it this way, but if you do, let us know how it works out. You may get the water up to temp. but I think the recovery will be extremely long. With my single loop coil over the firebed it still take anywhere from 5-8 hrs to recover. Keep in mind I'm using the thermosiphon method with no pumps. Good Luck.
As far as recovery time. It is just my wife and I in the house. We get up for work around 4 AM in the morning and return around 5 PM. We both take showers in the morning also. So... It has some time to make up especially with 80 gallons of storage.
franco b wrote:It seems to me that the fin tube should be horizontal so the fins are aligned for best air circulation.
With the fins holding the copper tubes away from the hot surface, then conduction will be poor. Why not a flat copper tank the full size of the stove surface pressed up against it? Far better conduction. Circulation will also be much better. Enclose with insulation the outer surface.
Yes that is a good point. I had thought about having two pieces of 3' fin tube against the hottest side of the stove and possibly making a cover around them to retain the heat around the tubes.
Well I thank you all again for your comments.