Hot water - Page 3 - SailNet Community

   Search Sailnet:

 forums  store  


Quick Menu
Forums           
Articles          
Galleries        
Boat Reviews  
Classifieds     
Search SailNet 
Boat Search (new)

Shop the
SailNet Store
Anchor Locker
Boatbuilding & Repair
Charts
Clothing
Electrical
Electronics
Engine
Hatches and Portlights
Interior And Galley
Maintenance
Marine Electronics
Navigation
Other Items
Plumbing and Pumps
Rigging
Safety
Sailing Hardware
Trailer & Watersports
Clearance Items

Advertise Here






Go Back   SailNet Community > Out There > Cruising & Liveaboard Forum > Living Aboard
 Not a Member? 


Like Tree1Likes
Reply
 
LinkBack Thread Tools
  #21  
Old 01-02-2012
Senior Member
 
Join Date: Feb 2010
Location: Narragansett Bay
Posts: 8,645
Thanks: 10
Thanked 110 Times in 105 Posts
Rep Power: 6
Minnewaska will become famous soon enough Minnewaska will become famous soon enough
I've never had an instant hw heater, but this ocurrs to me. Perhaps there is more to it. In order to really have instant propane fueled hot water, it seems you would need to leave the propane lines charged through your boat at all times, which is a bad idea. You should have an electric solenoid that shuts the line down at the tank, so your bilges don't fill with propane while you sleep and that first switch ignites the boat. However, you would have to cycle it on and off each time you wanted hot water. Proper protocol would also have you purge the propane line to extinguish the flame as well. That doesn't sound so instant to me.
__________________

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

Jeanneau 54DS

In the harsh marine environment, something is always in need of repair. Margaritas fix everything.
Reply With Quote Share with Facebook
  #22  
Old 01-02-2012
TQA's Avatar
TQA TQA is offline
Bombay Explorer 44
 
Join Date: Apr 2009
Posts: 2,414
Thanks: 0
Thanked 32 Times in 28 Posts
Rep Power: 6
TQA is on a distinguished road
I had an instant water heater [ gas ] on a previous boat. It was great when we were above the latitude that the butter melts at.

No such animal now I live year round where the butter melts but I do have a solar bag water heater for the odd time that I feel the need for a hot shower.
Reply With Quote Share with Facebook
  #23  
Old 01-02-2012
pdqaltair's Avatar
Senior Member
 
Join Date: Nov 2008
Location: Deale, MD
Posts: 2,084
Thanks: 1
Thanked 23 Times in 23 Posts
Rep Power: 6
pdqaltair is on a distinguished road
My boat has a factory installed on-demand heater:

Yes, it has a flue (sealing to protect from green water--you MUST remember to open it), separate combustion air supply (ABYC suggests a separate sealed compartment, which it has; this is a very difficult requirement for most boats), leak detector, and flame interlock. It works well... sort of.

a. Showers always go through a lot of water, but more so when using hot water, because of the time required to heat the pipes and adjust the temperature.

b. It really doesn't work so well for galley hot water, for the same reason; the waste each time is OK at home, but unacceptable even on a boat in a marina. I end up always using cold water for dishes. Thus, I DO NOT leave the unit on unless I am taking a shower.

c. The temperature regulation is not perfect, not quite like a tank. To get steady temperature you need to let it run wide-open, which wastes more water, even for the fastest shower taker.

d. A hot shower put TON of moisture into the boat. This is never acceptable, summer of winter. While a bathroom fan helps, not enough.

Alternatives?

a.Shower ashore.

b. When on the hook in the summer, take cold showers on-deck (we have a transom shower and use it a lot). This can be done discretely in the cockpit, wearing a bathing suit for the most part. The water is not really cold on a boat, since the pipes are not underground.

c. I don't care for solar showers; if it's warm enough to work well, I can take it cold more simply.

If I were living aboard and could manage the space, I would go for a small engine-heated electric tank heater. If it had to be propane on-demand, make sure the installation is faultless. And I would use marina facilities most of the time.

---

Before you consider going for a ventless heater--the OP did not suggest this but many have in the past--realize that a hot water heater has a HUGE firing rate compared to the stove: 199,000 btu vs. 8,000 BTU. These MUST be vented in a small place like a boat. There have been several cases reported of sailors getting knocked out while showering.Propane possible boat peril One sailor died, another sickened while in shower - Baltimore Sun
WanderingStar likes this.
__________________
(when asked how he reached the starting holds on a difficult rock climbing problem that clearly favored taller climbers - he was perhaps 5'5")

"Well, I just climb up to them."

by Joe Brown, English rock climber




To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

Last edited by pdqaltair; 01-02-2012 at 09:24 AM.
Reply With Quote Share with Facebook
  #24  
Old 01-02-2012
Senior Member
 
Join Date: Nov 2008
Location: Long Island
Posts: 2,129
Thanks: 1
Thanked 0 Times in 0 Posts
Rep Power: 6
WanderingStar is on a distinguished road
Great review, thanks.
Reply With Quote Share with Facebook
  #25  
Old 01-02-2012
Member
 
Join Date: Jun 2011
Posts: 76
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 4
ggray is on a distinguished road
Quote:
Originally Posted by pdqaltair View Post
a. Showers always go through a lot of water, but more so when using hot water, because of the time required to heat the pipes and adjust the temperature.

I installed a Wolter flash heater on our last cat, but concerned about using too much water, I plumbed a recirculating line that fed right back to the Wolter intake connection. I would hold the hot water line at the shower, and when it became warm, I'd close the recirculating valve.

Imperative not to leave the valve open as the temp would climb and climb and damage to the heater could occur.
Reply With Quote Share with Facebook
  #26  
Old 01-03-2012
Junior Member
 
Join Date: Dec 2011
Posts: 16
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 0
jackpal is on a distinguished road
In Hal Roth's book "How to Sail Around the World" he says that his wife and himself simple used a pump sprayer he modified with a nozzle from a kitchen sink. They would just boil a certain amount of water and pour it into the sprayer with some cool water. Then they would just pump up the sprayer with some pressure and shower. This way they were able to take hot showers and conserve water. I thought the book was great. It is just packed with information like that.
Reply With Quote Share with Facebook
  #27  
Old 01-03-2012
Senior Member
 
Join Date: Feb 2010
Location: Narragansett Bay
Posts: 8,645
Thanks: 10
Thanked 110 Times in 105 Posts
Rep Power: 6
Minnewaska will become famous soon enough Minnewaska will become famous soon enough
Pump sprayer is possible, but clearly it is more like camping than living in a waterside condo, as you put it. Depends on your requirements. We've decided to outfit our boat like it was our second home. Because it is. Electric tank water heater is always hot at the dock (unless we are away), air conditioning and heat pump, genset for when at anchor, etc.
__________________

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

Jeanneau 54DS

In the harsh marine environment, something is always in need of repair. Margaritas fix everything.
Reply With Quote Share with Facebook
  #28  
Old 01-03-2012
Junior Member
 
Join Date: Dec 2011
Posts: 16
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 0
jackpal is on a distinguished road
Yeah, I know. Its enough to make my head hurt. It will get worked out somehow. There is lots of good feedback in this thread that is going to help. Thanks.
Reply With Quote Share with Facebook
  #29  
Old 01-21-2012
sea_hunter's Avatar
Senior Cruiser
 
Join Date: Jul 2000
Posts: 512
Thanks: 0
Thanked 1 Time in 1 Post
Rep Power: 14
sea_hunter is on a distinguished road
Quote:
Originally Posted by jackpal View Post
I see alot of boats have hot water heaters. I think the better solution would be to have the instant hot water heaters instead of the tanks. They take up less space and are more efficient. I don't see alot of them on sailboats for some reason. It seems like an obvious thing to upgrade. Any big reasons not to use it ?
We have a Raritan 6 gallon marine (120V and engine). As liveaboards we found it inadequate for more than 2 showers in a row. We just installed a Wabasto diesel hydronic heating system and looped it through the Raritan. We now have "unlimited" hot water dependent only on the water left in the holding tanks. The water maker takes care of the water issues.
Reply With Quote Share with Facebook
  #30  
Old 02-10-2012
Junior Member
 
Join Date: Feb 2012
Location: Massachusetts
Posts: 24
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 0
Shemlock is on a distinguished road
Espar makes a tankless diesel fired heater that will run with your heat exchanger and service all your heat and hot water needs.Very compact and economical to run fuel wise and power drain wise. Not a cheap system but fits every requirement I would want on my sailboat.
Reply With Quote Share with Facebook
Reply


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools

 
Posting Rules
You may post new threads
You may post replies
You may post attachments
You may edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On


Similar Threads
Thread Thread Starter Forum Replies Last Post
Air, Water or Air / Water Cooled Refer Condensor OceanFreedom Gear & Maintenance 12 02-03-2011 12:35 AM
Fresh Water cooling water dirty brown sailak Gear & Maintenance 17 07-31-2009 11:52 PM
Refrigeration -Using the water tank as a cooling water source HenryRusty Gear & Maintenance 7 03-29-2007 12:14 AM
Fresh water boat to salt water svs3 Boat Review and Purchase Forum 6 12-30-2006 12:41 PM
MD3B Volvo-Penta sea water to fresh water conversion slosharron Gear & Maintenance 20 06-17-2003 09:08 PM


All times are GMT -4. The time now is 01:41 AM.

Add to My Yahoo!         
Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
SEO by vBSEO 3.6.1
(c) Marine.com LLC 2000-2012