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Old 22-01-2020, 13:58   #1
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Join Date: Oct 2019
Location: St Mary’s GA
Boat: Owner built 60’ Aluminum Expedition Yacht.
Posts: 50
Hydronic air handlers

Hi. Looking for advice on water to air heat exchangers from those who have similar size system experience. Anyone using Thermatrom or LYTRON ?
We have two heaters. An Espar M, and an Espar 12. Both 24 volt.
Currently the M runs the hot water tank. The boat is aluminum 60’ pilot house so we are thinking one fan box for the forward cabin, one larger for the galley, and one for the aft cabin as well as the current domestic hot water. We would save the Espar 12 for additional heaters if we go north.
The M is 5000 to 32000 btu and the E12 is 4000 to 42000.
The boat is foam insulated with wood interior but has a lot of glass.
We’ve looked at a number of matrix boxes but Thermatrom has copper/nickel and 316 stainless coils...lot of options. Anyone experienced with EBM-PAPST roller bearing fans? We are willing to trade some noise for power to get toasty in the morning but recommendations for quiet running would be appreciated.
Thanks. Mark
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Old 25-01-2020, 12:53   #2
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Join Date: May 2013
Location: Oregon to Alaska
Boat: Wheeler Shipyard 83' ex USCG
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Re: Hydronic air handlers

I use the type shown by Heater Craft. They come with a grill or with 1-4 3" outlets at 28,000 t0 40,000 btu. I bought mine from:
https://shop.hamiltonmarine.com/depa...s-|HT|BHR.html
Also more models at: https://heatercraft.com/collections/heaters-1

I have one or more in each cabin. I have a house type boiler in my engine room, but recently bought a large Wabasto. My hydronic system also is tied into my main engines so cruising they supply the heat. And if the boiler is hot, before starting the mains, I can circulate hot water thru the engines.
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Old 30-01-2020, 14:58   #3
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Join Date: Oct 2019
Location: St Mary’s GA
Boat: Owner built 60’ Aluminum Expedition Yacht.
Posts: 50
Re: Hydronic air handlers

Hi. Thank you for your contribution , especially from someone with actual experience. We find it difficult to pry the construction details from those who manufacture heater matrix boxes. This is in stark contrast to those who produce water to air heat exchangers for non marine applications. Thermatrom and Lytron, for example, provide full details whereas so called marine matrix boxes provide only basic ...non construction, information. Tube type, thickness, pressure test, true measured performance results...it’s the old, just trust us. Or better, hire us to design your whole system !
If anyone has endured his tortured path before, an old manatee would deeply appreciate your acquired experience.
Kindest always. Mark the manatee
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