Grehan
Well-Known Member
Is it possible to use an ordinary domestic indirect hot water cylinder and immersion heater on a boat?
hot water
- Thread starter Grehan
- Start date
Ludd
Well-Known Member
Don't see a problem providing you've got room to mount it upright. My ''calorifier '' has a 240v domestic type immersion heater in it,tank is horizontal. But remember if you do that you will be depriving some swindlery of HUGE amounts of profit!! /forums/images/graemlins/laugh.gif
vyv_cox
Well-Known Member
My domestic hot water cylinder is old and was designed for convection, not pumped, heating by water from the boiler. Consequently the coil tubing is large, either 22 or 28 mm copper. This would be very large for the flow of water from a boat engine. If you can get one that has a 15 mm copper coil it would probably be OK, that's the size that was in my original calorifier. Otherwise a 15 mm restrictor on the exit side would be a solution, although not as good as a 15 mm coil.
Immersion heaters in domestic water tanks are quite large, 3kW(?) Marine ones are usually 850 watts to cope with the lower supplied current in most marinas and such. The fitting is the same size though, not too expensive to replace.
Immersion heaters in domestic water tanks are quite large, 3kW(?) Marine ones are usually 850 watts to cope with the lower supplied current in most marinas and such. The fitting is the same size though, not too expensive to replace.
Bilgediver
Well-Known Member
No problem at all if you ave room and a correctly designed matching system.
Just remember that in many domestic hot water tanks the electric heater is at the top of the tank and tened only to heat the water at the top so doesn t give the maximum storage of hot water and this will be specifically so if you reduce to a shorter 850 watt unit to suite marina power. You may want a plumber to put a side entry immersion coupling lower down.
You can take care of the flow rate by the sizing of the pipe to the heating coil. Here in the house this is now throttled by a couple of 15 mm elbows and is fine.
You will need a pumped system to circulate the primary water through the coil which could also be heating hot water radiators.
Just remember that in many domestic hot water tanks the electric heater is at the top of the tank and tened only to heat the water at the top so doesn t give the maximum storage of hot water and this will be specifically so if you reduce to a shorter 850 watt unit to suite marina power. You may want a plumber to put a side entry immersion coupling lower down.
You can take care of the flow rate by the sizing of the pipe to the heating coil. Here in the house this is now throttled by a couple of 15 mm elbows and is fine.
You will need a pumped system to circulate the primary water through the coil which could also be heating hot water radiators.
