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02-16-2022, 02:14 PM
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#1
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Established Member
Join Date: Apr 2020
Location: Las Vegas
Posts: 10
M.O.C. #26068
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System capacities
Greetings all. Hoping this hasn't been beaten to death already, but I am once again frustrated by the lack of information available from Keystone. Having spent a career in aviation I was used to being able to open a manual and find, at the very least, simple block diagrams depicting onboard systems. Anyway, what I'm after is the capacity of the fresh water tank on our 2015 Montana 3160RL. Every on-line search I've attempted says 66 gallons and I'm sure I've seen 60 gallons somewhere in the past. Today I drained the system, including the water heater, and after bleeding the hot water side of the system of air my water meter showed only 52 gal when the tank vent began spewing water. That supports the 40 gal plus 12 in the water heater theory unless I missed something in the refill process.
Anyone out there who like to add to the confusion?
Thanks very much - Mike
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02-16-2022, 02:19 PM
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#2
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Site Team
Join Date: Sep 2017
Location: Oro Valley
Posts: 3,961
M.O.C. #20477
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It is about 50 gal usable. Carry a bladder and a pump to refill when needed.
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Zack and Donna plus Millie and Ranger
2018 3160RL
"Life is too short to stay indoors, enjoy the ride!"
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02-16-2022, 02:49 PM
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#3
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Montana Master
Join Date: Oct 2012
Location: Box Elder
Posts: 4,728
M.O.C. #12947
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Ours is also rated as 66 gallons fresh capacity, but that includes the 12 gallons in the water heater tank, so your 52 gallons in the actual tank is pretty close, the same as ours. The other two gallons would be in the plumbing system.
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Bob & Becky
2012 3402RL
2012 Chevy 2500HD D/A CC 4WD
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02-16-2022, 03:22 PM
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#4
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Established Member
Join Date: Apr 2020
Location: Las Vegas
Posts: 10
M.O.C. #26068
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Thanks for responding. Until today I was going on that theory: 60 gal including the water heater. However, today I drained he water heater, then bled the air out of it by opening a hot water faucet. Then when the air stopped (and it took a while) and was replaced by water it seemed reasonable to believe the water heater was then full. I continued the fill until water came out the tank vent. At that point I was at only 52 gallons on the in-line water meter. Though math was always my very worst subject I believe that those numbers would support the "40 gallon tank plus the water heater" theory.
I'm probably spending way too much time this, and most of the time it's not an issue. I must admit that my frustration and disappointment with these manufacturers does fuel my stubbornness, so I'll just let it go, relax and enjoy the rig...
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02-16-2022, 03:56 PM
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#5
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Montana Master
Join Date: Oct 2004
Location: Salem
Posts: 7,580
M.O.C. #2283
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It is a little misleading but you take the water heater out and all the lines.
Lynwood
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02-16-2022, 05:15 PM
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#6
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Montana Master
Join Date: Oct 2018
Location: Anderson
Posts: 2,633
M.O.C. #22835
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You already did the absolute best think to find your own answer, you used a water meter and filled everything when it was empty. You now know how much is actually in the water heater and the fresh water tank. And that my friend, is really the best you can do. Everything else is just numbers on an internet page.
The next thing you might try to do is fill the fresh water tank and keep track of how many gallons of water can actually be pumped out of the tank with the on-board water pump. This number may be less than the 40 and probably is. Then, when the pump does nothing but pull air, drain your fresh water tank into a bucket on the ground and measure how much is remaining in the tank that's not usable, but is obtainable if you have no other choice.
We purchased a water meter for our camper last year and it was one of the better things we did. Even though we always, 100% of the time, use our fresh water tank, we still had no clue how much water we were actually using. Now we do.
We live in the country and are on a an electric submersible pump well. We never hear the pump actually run (never), and of course, the water is not metered in any way. So, even at home, when filling the fresh water tank in the camper, we have no clue how much we are filling. We have no clue how much our actual usage is in the house either. So the meter on the camper was a true eye-popper!
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History is not about the past, it's an explanation of the present.
2019 Montana High Country 375FL
2014 Chevy Silverado Duramax, 6.6L Dually
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02-16-2022, 08:42 PM
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#7
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Montana Master
Join Date: Dec 2007
Location: Kansas City, Missouri
Posts: 2,710
M.O.C. #7992
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Just looking for reasons for the differences. Is it possible the meter is not accurate?
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2006 3000RK
2009 Ram 2500
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02-20-2022, 02:17 PM
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#8
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New Member
Join Date: May 2018
Location: Anderson
Posts: 2
M.O.C. #21676
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I too am disappointed in Keystone's refusing to share technical information about their products...disappointed is not a strong enough word though. I've had a Winnebago motor home since 2004 and any and all information is available. Want to mount something, they will share detailed drawings for your coach about wall construction. I bought a complete wiring diagram at purchase and have downloaded plumbing diagrams as well. After purchasing a 2011 Montana I contacted Keystone's and was told by a snippy woman that "Keystone's does not support owner modification of their products"! I told her I wish I had known that before I invested money in one of their products. That was several hears ago and I still get angry!
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02-20-2022, 08:29 PM
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#9
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Montana Fan
Join Date: Apr 2021
Location: everywhere, USA
Posts: 285
M.O.C. #28634
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coach details lacking
From what I have been able to find, during a few search's for info of my own.
Keystone does not give a high amount of detail direction to their builders so that any 2 of the same model units are built the same, hence their resistance to give out any detailed data. Because they cant! But I may be wrong!
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2021 Montana 3761FL, 9 LIFPO4 batteries & 1700 watts of panels w/ Multiplus II 3K inverter and 30amp DC to DC charger from truck. 8k Dexter axles w/ Kodiak disc brakes.
2019 6.7 diesel F350 DRW with Banks derringer and 4"exhaust, airlift bags, 25k B & W Companion hitch, 45 gal. aux. diesel tank and 14k Winch, just in case!
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02-28-2022, 08:07 PM
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#10
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Seasoned Camper
Join Date: Jan 2019
Location: Winter Haven
Posts: 76
M.O.C. #23309
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I have the same issue with Keystone and the RV industry in general. I was a pilot and A&P mechanic also. These folks could make things a lot easier with very little effort.
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2019 3121RL
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03-02-2022, 09:22 AM
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#11
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Montana Master
Join Date: Feb 2020
Location: Bencia
Posts: 538
M.O.C. #25828
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Specs say 66 gallons. I like your method of draining all the tanks and re-filling with a water meter to measure its capacity. I am curious about the meter's accuracy but that could be confirmed by filling a 5-gallon bucket to verify. I use a turbine meter to pre-fill the holding tank but have never tried to fill it its spec capacity due to the risk of over filling it.
https://www.rvusa.com/rv-guide/2015-...3160rl-tr24014
__________________
2020 Montana 3780RL fifth wheel
2016 F-350 6.7L Diesel Crew Cab Long Bed DRW
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04-18-2022, 07:03 PM
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#12
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Established Member
Join Date: Apr 2020
Location: Las Vegas
Posts: 10
M.O.C. #26068
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Following up on this subject, it's been a while, but I must report that, assuming the information is correct, here's what I got from Keystone after giving them my VIN:
"Thank you for contacting Keystone RV. Your fresh water tank has a 54 gallon capacity and the water heater holds 12 gallons. Have a great weekend!"
This is the best response I've gotten from them. Usually I am disappointed, but on this they appear to have done the right thing. Maybe there's hope...
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