Free 7 Day Trial RV GPS App RV Trip Planner Campground Reviews RV Maintenance Free 7 Day Trial ×


Reply
 
Thread Tools Display Modes
 
Old 03-03-2021, 01:37 PM   #1
Mini-Skoolie
 
Join Date: Aug 2020
Location: New York
Posts: 19
Year: 2004
Coachwork: International
Engine: DT466e
Tankless electric water heater recommendations?

Hi! I'm looking for a tankless electric water heater. Any recommendations?
claudrea is offline   Reply With Quote
Old 03-03-2021, 04:23 PM   #2
Skoolie
 
Join Date: Apr 2020
Location: Northern California (Sacramento)
Posts: 238
Year: 1999
Chassis: Ford E450
Curious why electric-maybe you have a huuuuuge solar array?
Rucker is offline   Reply With Quote
Old 03-03-2021, 04:29 PM   #3
Bus Crazy
 
Jolly Roger bus 223's Avatar
 
Join Date: Sep 2017
Location: Swansboro,NC
Posts: 1,604
Year: 86
Coachwork: Thomas
Chassis: Ford B700
Engine: 8.2
Rated Cap: 60 bodies
just a thought?
for almost anything electric?
the higher the voltage the more energy efficient the appliances are.
so a 240v instantaneous water heater will be cheaper to use in the long run but what would the upfront cost be to run a 240v setup?
why not propane fired with a 12v ignitor? or something similar?
Jolly Roger bus 223 is offline   Reply With Quote
Old 03-03-2021, 07:57 PM   #4
Mini-Skoolie
 
Join Date: Aug 2020
Location: New York
Posts: 19
Year: 2004
Coachwork: International
Engine: DT466e
We are planning on running all appliances on solar energy! We don't feel comfortable having propane on board!
claudrea is offline   Reply With Quote
Old 03-03-2021, 08:06 PM   #5
Skoolie
 
Join Date: Jan 2021
Location: Earth
Posts: 199
Year: 2013
Chassis: IC RE
Engine: HT570 / 3500SP
Rated Cap: 4
At home, we had an ecosmart 18. 18kW. Just enough for running a shower comfortably. I can't imagine running that thing from solar power.
ABBus is offline   Reply With Quote
Old 03-11-2021, 02:00 AM   #6
New Member
 
Join Date: Sep 2017
Location: North of Toronto, Ontario (Canada)
Posts: 8
@OP did you ever find one you liked? I'm in the same boat, don't want to have any propane on board for a bunch of reasons and want to do hot water on demand via electricity. Would love to hear if you found something suitable
Morgan is offline   Reply With Quote
Old 04-13-2021, 01:18 PM   #7
Mini-Skoolie
 
Join Date: Nov 2020
Location: Fort Lauderdale, FL
Posts: 22
Year: 2002
Coachwork: AmTran
Chassis: Genesis
Engine: DT466
Rated Cap: 28ft
Quote:
Originally Posted by Morgan View Post
@OP did you ever find one you liked? I'm in the same boat, don't want to have any propane on board for a bunch of reasons and want to do hot water on demand via electricity. Would love to hear if you found something suitable

Looking to follow-up on this question too!

Anyone else have suggestions?
kuja is offline   Reply With Quote
Old 04-13-2021, 04:36 PM   #8
Skoolie
 
Join Date: Apr 2020
Location: Northern California (Sacramento)
Posts: 238
Year: 1999
Chassis: Ford E450
I did a little research. If you limit yourself to 110 volts there is no solution. 110v just does not provide enough flow for more than washing your hands, literally. About a half a gallon per minute (GPM). Maybe you can wash one hand and get away with that.

220v options are many; all require massive current, starting at around 30 amps for a minimal flow of ~2 GPM. By comparison, my propane system pumps 2.64 GPM. Propane does a fantastic job at adding calories of heat.

So heating water quickly falls into two camps, 1)those who use propane, and 2) those who have massive solar systems, inverters and battery banks. I'm guessing ten grand plus systems. From the lack of response to your question I suspect there are few in the second category.

I'm reminded of many posts in this forum that end with 'you may want to rethink your constraints, or what it means to live the skoolie life'. Hope this helps.
Rucker is offline   Reply With Quote
Old 04-13-2021, 07:14 PM   #9
Skoolie
 
Willie_McCoy's Avatar
 
Join Date: Aug 2018
Location: Rhode Island
Posts: 233
Year: 1980
Coachwork: Crown Coach
Chassis: Supercoach
Engine: Detroit 671T
Quote:
Originally Posted by Rucker View Post
I did a little research. If you limit yourself to 110 volts there is no solution. 110v just does not provide enough flow for more than washing your hands, literally. About a half a gallon per minute (GPM). Maybe you can wash one hand and get away with that.

220v options are many; all require massive current, starting at around 30 amps for a minimal flow of ~2 GPM. By comparison, my propane system pumps 2.64 GPM. Propane does a fantastic job at adding calories of heat.
This is the answer right here. There are very few viable options for electric tankless water heaters in a residential application where the available power is effectively limitless. I have been in the plumbing and heating industry for over 20 years now and have never installed an electric tankless heater outside of point-of-use 110v units for handsinks that are rated for 0.5gpm or less. They just aren't a viable option when flowrates rise.

That being said, and given your absolute refusal to use LP, I still think there may be ways to heat water with electricity but they will require some ingenuity, creativeness, and a storage tank.

Rucker, what are you using for a tankless LP heater?
__________________
Supercoach Build Thread
Instagram
Willie_McCoy is offline   Reply With Quote
Old 04-13-2021, 07:31 PM   #10
Skoolie
 
Join Date: Apr 2020
Location: Northern California (Sacramento)
Posts: 238
Year: 1999
Chassis: Ford E450
Quote:
Originally Posted by Willie_McCoy View Post
Rucker, what are you using for a tankless LP heater?
Camplux 10L 2.64 GPM High Capacity Propane Tankless Water Heater, White. Cost about $280, runs on 110 (very low amp usage). I did not want the double D battery version of this heater.

I've picked up a recirculating pump, and have to decide whether to put it in. I might wait and see how it works first. The thinking is I can add hot water capacity with a holding tank if needed, to keep the instant heater from cycling on and off.

I have a propane tank enclosure, vented, and just run the water heater off the barbecue-style tank.

I mounted the heater inside and it vents through one of the little slide windows in the shuttle bus. Open the window and pop out the vent, it's ready to go. When done, stow the vent, close the window. No wall or roof penetrations.

I was going to run it on a separate, 500W inverter so I could turn off the 2Kwatt inverter for eco-mode, but I'm still figuring out how auto-transfer of shore power and battery will work.
Rucker is offline   Reply With Quote
Old 04-13-2021, 11:36 PM   #11
Bus Nut
 
Join Date: Oct 2020
Location: Near Flagstaff AZ
Posts: 617
And, keep in mind that the mention Rucker made of a 220/240 volt heater drawing 30 amps (minimum) was at that voltage...at 12 volts, that's 550 amps (plus the inverter conversion loss). With a typical 400 ah battery bank, even if you could draw at that rate without melting things, it wouldn't be long before you would crush your batteries to the max dod.
rossvtaylor is offline   Reply With Quote
Old 04-14-2021, 12:09 AM   #12
Bus Nut
 
Rivetboy's Avatar
 
Join Date: Jul 2017
Location: Huntington Beach CA.
Posts: 893
Year: 1991
Coachwork: Bluebird
Chassis: T/C 2000 28 foot Handy Bus
Engine: Cummins 5.9 Mechanical
Rated Cap: 2
Quote:
Originally Posted by claudrea View Post
We are planning on running all appliances on solar energy! We don't feel comfortable having propane on board!
Well! My advice to you is to learn how to do load calculations. This required skillset will teach you that hot water from electricity does not come from Unicorn farts. If you want a a reasonable sized water heater that provides 2.5 GPM of heated water
it will need (X) watts.That is the minimum in solar array for your purpose of heated water. Now add in the load of the water pump and you have hot water when the sun shines Now, figure out how big of a battery bank you will need to provide that for multiple cloudy days and nightime.
Your system fails quickly when there is no sun and batteries are depleted = no hot water. By the way, what are you planning to cook with? (another huge electrcal load) What are you going to do when the batteries die?
Back up candles?
Fire up that Unicorn fart generator...
Rivetboy is offline   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


» Featured Campgrounds

Reviews provided by

Powered by vBadvanced CMPS v3.2.3

All times are GMT -5. The time now is 06:21 PM.


Powered by vBulletin® Version 3.8.8 Beta 4
Copyright ©2000 - 2021, vBulletin Solutions, Inc.
×