Persistence came with a broken Wolter (heating tubes had been split open by frozen water). I silver-soldered the tubes and got a few years out of it, but in due course it opened up again – I obtained several discarded units for parts and tried to nurse it along, but the age of the parts became an issue.
I then installed a Volvo hot water tank that heated water from the engine and from AC at the dock. It worked well, but engine heat did not seem to bring it up as well as the AC – I needed to run well over an hour to get it hot for a shower and the dishes, and by morning at anchor it was tepid. But MUCH better than nothing.
When the Excel 1.6 gpm heaters came along I installed one in the same mounting area as the Wolter, and vented it using the existing vent. Some issues with draft (would not stay lit), but I added a fan (like the Wolters had) and that helped a lot.
I then integrated the two systems so I could use the tank water (more reliable for showers!) when available and switch over to the demand water when I am sitting at anchor. I am pleased with the option, but not sure I would have gone to the engine heat had the Excel been available.
Bill Baxter
Persistence NS30 #507
Penetang, ON
From: ina-nonsuch-di...@googlegroups.com [mailto:ina-nonsuch-di...@googlegroups.com] On Behalf Of Tim in STL
Sent: March 28, 2019 10:21 AM
To: INA Nonsuch Discussion Group
Subject: Re: How safe is the unvented Excel Water Heater?
White O'morn, our 1986 NS26U came to us with a Wolther water heater, it seems as though it might have been original as it fits all of the mounting holes and lines up perfectly with the vent stack. It was disconnected when we bought the boat hand I don't feel very secure in reattaching the lines. Does anyone know anything about the Wolters? I think I will add an engine hot water heater.
Tim in STL
White O'morn NS26U #216
Harbor Point Yacht Club
West Alton, MO
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I had thought of trying a bilge blower fan in the exhaust stack but thought it might not stand up to the exhaust temp.
Thank you.
Hi John,
You may well be right – but when it comes to CO I take a belt-and-suspenders approach. Most Excels are installed where a vented water heater was previously installed, so venting is easy. In my case, I added a small computer fan underneath the Excel housing to help with ‘active ventilation’.
Bill Baxter
Persistence NS30 #507
Penetang, ON
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I'm replying to your post from last spring regarding an old Wolter unit sitting in your garage. Is this still available? I just commissioned my new to me 30U and the Wolter heater is leaking. It appears to have been repaired numerous times before by resoldering the tube joints so a replacement seems like a better option. If your old Wolter is still available and in good condition I'd give that a try before purchasing a new Excel which sounds like the recommended new replacement option by most.
Thank you,
Greg Doyal
NS30U #516 Challenge
Grosse Pointe, MI
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Joe Valinoti
S/V iL Gatto NS30U #221
Sea Harbour YC
Oriental, NC USA
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Peter: We were discussing propane (have to light) vs engine heaters which are just there when you need them.Joe
~~~~~(\_ ~(\_ ~(\_~~~~~~~~~~From: Peter MoodieSent: Friday, May 22, 2020 12:48 AMSubject: Re: Wolter water heaters / engine heated water
--BTW, I’ve never had to come back out of the shower and turn on the hot water that I’ve forgotten. (Photos available)
Joe Valinoti
S/V iL Gatto NS30U #221
Sea Harbour YC
Oriental, NC USAHi Joe,For a moment I was wondering if I had jumped into another forum, like Cruising Anarchy!!!!Peter MoodieNonsuch 30U Catalyst #366Sidney, BC/Winnipeg, MB
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On May 23, 2020, at 8:02 AM, Greg Doyal <gregor...@gmail.com> wrote:
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https://www.pysystems.ca/resources/tech-talk/whats-hot-in-onboard-heating-systems/
Mark Powers
La Reina 26C
Vancouver, B.C.