Tankless, ventless propane water heater thoughts?

kito

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Sep 13, 2012
2,011
1979 Hunter Cherubini 30 Clemmons
I did a search and found some old posts about the pros and cons. Just wanted some input on newer models. It seems like the perfect setup for me. I don't have to mess with running the engine to heat up the water when out sailing. I don't have to use expensive 120v shore power to heat up a tiny 6 gallon tank. And most of all, it will fit through my cockpit starboard seat locker and will be out of the cabin. It has an electric ignitor so no pilot light. I plan on still installing a blower plus a CM detector.
 
Jan 13, 2011
94
Hunter 33 (78 Cherubini) Aberdeen Proving Ground, MD
Have One....

We boaters are "nuts" about water conservation. Turn water on....soap. Turn water on...rinse. Repeat as necessary.

The igniter does not operate until the water flows. The water is heated only when it flows. There is a "delay between the two events...and hot water.

If you have unlimited water. It is a great option. Turn the water on and get wet. My wife and I shower together and save the water from two showers.

Keep in mind that with this option your pump is moving up to 5GPM. You "burn" 20 gallons of water with a five minute shower with the water running constantly.

Otherwise, conserve water and expect a few secods of cold water each time you turn the shower wand off.

I like the two people shower option.
 

kito

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Sep 13, 2012
2,011
1979 Hunter Cherubini 30 Clemmons
Don't care about conserving water. Care more about burning diesel just to heat up the water warm enough to use. I do need a new water heater anyway. The one I have doesn't have an exchanger which means cold water while sailing plus it's only about 2 gallons. I can get the old one out easy enough but to put in a conventional 6 gallon water heater with exchanger means a major project. The Excel heater runs off only propane and kicks on when water pressure drops. Looks like within a few seconds hot water is out the faucet. No big, heavy expensive tank. Just looking for others input that has used this system.
 
Feb 10, 2004
4,096
Hunter 40.5 Warwick, RI
I have heard that none of these are approved for marine use on small boats. You should check on this and consider the impact on your insurance should a problem occur.

Having said that, I personally had a propane unit on my last 30' boat and it worked just great. It was located in the head directly under an opening hatch and I had to light the pilot when I wanted to use it. I remember a minimal delay to get hot water, but the temperature on my unit varied according to water flow. New units may have addressed this issue. I had a 6' water hose on this unit and I could take the hose and fill a sink to wash dishes and I could put the hose up the hatch and take a shower on deck. I did not have a shower sump in this old sailboat.
 
May 16, 2014
13
Hunter 450cc Miami Beach
Hi. Just wanted to add to the forum. I Took the plunge and bought this for my hunter 450 cc ;
http://www.ebay.com/itm/1-6-gpm-Exc...234?pt=LH_DefaultDomain_0&hash=item4629bfe3aa

My local propane dealer made a fitting for small green camp/grill propane tank and I just connected a 7 foot hose from my faucet to the unit and back to my shower head.
The reason for this is because I didn't want to bother plumbing into the boat's gas system. This is all contained in my shower.

The thing is great ! Only problem is, I want to stay in the steaming hot shower forever !

One caveat is that only the lowest setting is bearable. Otherwise it's waaaay to hot. I may fiddle with getting longer hoses to mitigate the temp and to clean up the lines a bit.

I'll try to post a pic of the set up
 

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kito

.
Sep 13, 2012
2,011
1979 Hunter Cherubini 30 Clemmons
Hi. Just wanted to add to the forum. I Took the plunge and bought this for my hunter 450 cc ;
http://www.ebay.com/itm/1-6-gpm-Exc...234?pt=LH_DefaultDomain_0&hash=item4629bfe3aa

My local propane dealer made a fitting for small green camp/grill propane tank and I just connected a 7 foot hose from my faucet to the unit and back to my shower head.
The reason for this is because I didn't want to bother plumbing into the boat's gas system. This is all contained in my shower.

The thing is great ! Only problem is, I want to stay in the steaming hot shower forever !

One caveat is that only the lowest setting is bearable. Otherwise it's waaaay to hot. I may fiddle with getting longer hoses to mitigate the temp and to clean up the lines a bit.

I'll try to post a pic of the set up
Thanks for posting. I still haven't installed my Excel heater yet but will look similar to yours using the one pound bottles. Mine will be under the lazarette and will feed the galley sink and bathroom sink/shower. Glad you like yours.
 
May 16, 2014
13
Hunter 450cc Miami Beach
Be careful, it gets really hot ! I went this route because installation took exactly 10 minutes ! If I try to plumb into multiple sites I would procrastinate .
All the best . Now good luck trying keeping your showers short!
 

kito

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Sep 13, 2012
2,011
1979 Hunter Cherubini 30 Clemmons
I am basically just replacing an old electric 2 gallon heater so all the hoses are already there to be hooked up. I still need a propane hose like you have though. My shower area is a joke. I will be taking most of my showers in the cockpit. I have a galley faucet head with a 6 ft hose that will reach outside.
 
Feb 6, 1998
11,701
Canadian Sailcraft 36T Casco Bay, ME
Thanks for posting. I still haven't installed my Excel heater yet but will look similar to yours using the one pound bottles. Mine will be under the lazarette and will feed the galley sink and bathroom sink/shower. Glad you like yours.
Please be aware that if you are required to have an insurance survey they may require you remove this water Hester. I had to remove one for a customer who was rather irate he was mislead by Excel into believing this was a "marine compliant " heater. These do not meet the minimum safety standards and like it or not surveyors survey to ABYC standards especially when it comes to items such as LPG systems..
 

kito

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Sep 13, 2012
2,011
1979 Hunter Cherubini 30 Clemmons
Does all appliances in boats need ABYC certification to pass an insurance survey?. I also installed a Attwood 3 burner propane stove top designed for RV use.
 
Feb 6, 1998
11,701
Canadian Sailcraft 36T Casco Bay, ME
Does all appliances in boats need ABYC certification to pass an insurance survey?. I also installed a Attwood 3 burner propane stove top designed for RV use.
If you carry insurance any upgrade should ideally be done to ABYC or as close to it as possble. It is getting harder and harder to find a "Lick & Stick" surveyor these days due to liability.

Fuel systems
LPG systems
Bilge systems
Electrical

Are the big ticket items for failing surveys these days. There is no such thing as being "grandfathered" when a boat is to be insured though many assume their boat should be grandfathered.. The insurance company wants to know they are insuring a boat that is "safe" and "safe" to insurance companies goes by the surveyors finding report. The surveyors survey to ABYC standards. It is a simple Catch 22...

The real crux is that insurance companies and their surveyors follow the current acceptable safety standards whether we like it or not. I realize most don't like this, so I suggest taking it up with your insurer. BTDT.....:doh:

I would strongly urge anyone reading this thread to call your insurance company and simply ask them if a non ABYC or ANSI compliant water heater is okay for you to install, and if so, are you covered in case of an accident with it.? This should be sqaure #1!!!!

Regardless of whether something is perceived by the public as safe, economical or the law the insurance company is usually the final word if you want to retain coverage.

The ABYC and USCG will not come banging on your door but the insurance company may just drop you if you don't bring your survey findings in line. If you've not had an insurance survey in a while, DON'T CHANGE INSURERS!!!:)

In the last few years, from insurance surveys alone, I have had to:

*Bond a keel stepped mast to external ballast (after a strike claim & this is NOT a standard)
*Bond numerous boats for AC Grounding to DC Grounding
*Add over current protection where it did not exist (house banks for example)
*2 Boats for the 10' rule (AC shore power inlet rule)
*1 Boat for an improper AC main breaker (not double pole)
*Multiple boats for GFCI outlets
*Multiple boats for lack of DC over-current protection
*Multiple boats for LPG system issues (too many to list)
*1 Boat for AC/DC isolation (cover for AC) behind AC/DC panel
*Multiple boats for fuel system issues (too many to list)
*1 Boat for lack of a reverse polarity indicator
*Approx three boats for non compliant battery chargers
*2 Boats for ignition protection issues on gas boats.
*1 Boat for lack of a bilge blower
*Improper bonding of chargers and inverter/chargers
*2 Boats for a bilge pump alarm
*Multiple boats for deteriorated below waterline hoses (one just last week)
*Remove a non compliant on-demand water heater (Excel)
*Multiple battery system compliance issues including venting, acid containment, over current protection etc..
*Multiple unsafe termination issues (solder, wire nuts, tape etc.)
*Steering system failures (meat hooks etc.)

I had one boat, a Pearson 30, condemned by water intrusion into the decks and around the chain plates. The fix to the boat was more than the boat was worth. No one would insure it. Boat is now a derelict. If anyone thinks the ABYC safety standards don't have any weight on your recreational, insured boat, this would be wishful thinking. I get to fix this stuff regularly including items that are not even required under the standards...

There are many more that I am just forgetting... Insurance companies and surveyors today are playing a CYA game. In today's day and age it does pay to use the available safety standards as a solid guideline for boat upgrades. The survey industry uses them so the closer your boat is to those guidelines (ABYC) the better chance you will have at skating through clean on an insurance survey. A number of people died years ago due to on-demand water heaters and since then this has been a big red flag for insurance companies. It is getting tougher and tougher to find a "lick & stick" surveyor these days due to the litigious nature of our society.

NOTE: "Lick & stick" is a term for those of us in states that require State inspection stickers on cars. Anyone who's ever owned an old car knows what a "lick & stick" garage is..... A few extra dollars and the problems just go away and he licks the sticker and slaps it on... (wink)
 
May 16, 2014
13
Hunter 450cc Miami Beach
That's the great thing about this particular installation; I can remove it in 5 minutes. It's essentially portable. Thanks for all the info.
 
Jul 30, 2019
1
Vagabond 42 Stuart, Florida
So what is it about these propane on demand water heaters that make them fail the survey or fail the "standards". How does an open flame three burner stove and oven pass but an enclosed flame water heater with Oxygen Depletion Safety shutoff fail. It makes no sense to me.