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**Dockhead** · 22-04-2018, 07:34

Quote:

Originally Posted by Rex Delay

Espar is air. Last boat had a Paloma propane demand heater and it was pure luxury. Hot shower anytime. Seeking diesel alternatives has been challenging. In a wet climate, forced air systems are the driest heat, hydronic will make hot water but not dry the boat. Looking for demand hot water for under $1k. Do not wish to replace a functional heating system for big $ just for shower!

Well, you can install one of the 5kW Espar hydronic furnaces for not much more than that, if you do it yourself. A plate type heat exchanger is cheap enough. You can add a radiator or three if you want -- or not. Cheap and easy if you do it yourself.

A friend of mine is set up exactly like this -- boat was originally built with an air heater, and his previous owner added the hydronic just for hot water.

If you're in a cool climate, a radiator or towel rack in the heads is pure luxury -- keeps it dried out, dries out your towels, and can give you warm space for your shower -- if you have room enough in your heads.

Do you have a calorifier, or can you add it? This makes it all somewhat easier, and also gives you the chance to make hot water from your engine. Get a calorifier with dual coils -- one for the Espar and one for the engine.