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  Topic Review (Newest First)
02-16-2008 08:15 PM
camaraderie Here's espars brochure on how the whole thing works. Looks like it can be used for all hot water needs including heating. Interesting but complex system.
02-16-2008 08:02 PM
Yes, it's a hydronic water (space) heater!


Yes, you are looking at a hydronic type, diesel-fired heater. This amounts to the equivalent of a boiler in a house - that is, it uses a diesel fire to heat water, which then is piped (usually via hoses) to your domestic water heater, and also can be piped to small radiators (usually with a small 12 V fan behind them) in order to heat your cabin, head, vee berth, etc.

I am considering one of these for my boat as well. Another maker is Webasto.

The unit that you are looking at is made by Espar, and these are used not only for boats, but big rig trucks, in order to heat the sleeper cabin as well as to keep the diesel engine warm when shut down overnight. Sometimes you can get better prices on these units via a truck supply company vs. the always-more-money "marine" version (same thing)!
Any of these units will require a separate fuel supply pump (taking suction from your main engine diesel tank), and a small exhaust line (insulated, corrugated stainless steel) usually leading to a through fitting in the boat's transom.
Good luck, and let us know how your project turns out!
Happy sailing!
02-16-2008 07:18 PM
PBzeer Appears to be an on demand type, don't know how well it would work in your application.
02-16-2008 07:14 PM
theartfuldodger that's why I'm asking the question, under marine they have a heater and trying to understand how it works, wondering if it warms water and pipes it to heater cores in the boat like hot water heaters in a home or am I way off on this
02-16-2008 07:12 PM
sailingdog It is a water-based heater, not a water heater.... big difference... It uses water as a heating medium, similar to many baseboard radiators in older houses.
02-16-2008 07:09 PM
PBzeer From what it says, it seems not to be an actual water heater.
02-16-2008 07:06 PM
PBzeer Let's see if this works.
02-16-2008 07:01 PM
theartfuldodger I'm very sorry guess my eyes and fingers are not in tune will try this one more time
02-16-2008 06:40 PM
sailingdog Art-

All those links are busted too.

Originally Posted by theartfuldodger View Post
Then the site to it is this should work
02-16-2008 06:37 PM
theartfuldodger new computer here with vista, having hard time getting used to it, the site is
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