Jump to content

Tankless water heaters

Recommended Posts

Hi everyone, it's been a long time.

I'm going to be upgrading to a tankless water heater and would like everyone's thoughts.


I have it narrowed down to the Girard Gswh 2 or the Atwood tankless.


There is only $10 difference between the 2 units.


I can't see the point on keeping 10gal of water hot 24/7, now I do realize the burners are up 50,000btu compared to the


12,000btu of the tank model and I still believe that will use much less propane.


Any thoughts or experience with either unit would be greatly appreciated.

Link to comment
Share on other sites

I have the Gerard and it works great.

2009 Volvo 780. D-16 500hp 1850 torque with a Herrin hauler bed.

2015 Continental Coach

2008 650cc Suzuki Bergman

2013 Mustang GT 500 convertible

2014 Smartcar convertible

WWW.Hollyfab.com. (Metal Fabrication Company)

Jamesc@hollyfab.com (preferred contact method)

Link to comment
Share on other sites

I was curious why you did not consider the AquaGo, until I realized you still cannot buy them after-market. Only as an OEM.


HERE is my test report on the Truma. After a year of use in very cold weather and up to 8500' elevation I'm totally satisfied. It works exactly as you would want. Highly recommended if you ca get one.

Jack & Danielle Mayer #60376 Lifetime Member
Living on the road since 2000

PLEASE no PM's. Email me. jackdanmayer AT gmail
2016 DRV Houston 44' 5er (we still have it)
2022 New Horizons 43' 5er
2016 Itasca 27N 28' motorhome 
2019 Volvo 860, D13 455/1850, 236" wb, I-Shift, battery-based APU
No truck at the moment - we use one of our demo units
2016 smart Passion, piggyback on the truck
See our website for info on New Horizons 5th wheels, HDTs as tow vehicles, communications on the road, and use of solar power
Principal in RVH Lifestyles. RVH-Lifestyles.com

Link to comment
Share on other sites

Though not one of the units you mentioned, in 2006 I replaced the 10gal Suburban DSI tank heater in my 1999 King of the Road with a PrecisionTemp RV500. I bought it used for about $600. The only problem I have had was that someone let it freeze and I had to replace a couple of the thermistors. I also replaced the circuit board, mostly to get updated electronics and ROM.


It has been fantastic and I have never wished to go back to a tank heater. However, diagnosing the bad thermistors took a lot of trial and error frustration, but that was on me because I am cheap and would not just replace all 3 of them on principal.


Unlike some of the tankless units, it does try to keep the output temperature constant with fluctuations in pressure and the temperature of incoming water.


A few great things about it are:

  • doing the laundry, one load right after the other. The 10 gal could never fill a large load on warm with even tepid water and that was with both the Gas and Electric heating on simultaneously. All wash and rinse after that was always cold water.
  • warming up my fibromyalgic muscles
  • bathing the dog
  • Warming up completely after being outside in the cold rain.

Yes, it uses gas but I have honestly found that it uses no more than the tank. I just use it more, because I can.


It is the only thing that we use Gas for besides the furnaces so this was easy to track in Florida.


If the units you are looking into can maintain a responsive output water temp without having to keep adjusting the water flow in a shower to keep it the same temp, then great. I am just more of a set it and forget it guy.

RVBuddys Journal Our progress into full-timing.
Budd & Merrily ===-> SKP# 088936 Other Websites:---> Hub of all my blogs
Clifford - 2000 VNL64T770 :: DakotR - 1999 C40KS King of the Road :: $PRITE - 2013 Smart Passion w/cruise

Link to comment
Share on other sites

We have 12 Gallon tank. We do not keep the tank heaters on 24/7.The tank is heated maybe 6 hours a day Propane or electric. Might save on propane with a thankless but they are high on electric usage.

Helen and I are long timers ..08 F-350 Ford,LB,CC,6.4L,4X4, Dually,4:10 diff dragging around a 2013 Montana 3402 Big Sky

SKP 100137. North Ridgeville, Ohio in the summer, sort of and where ever it is warm in the winter.

Link to comment
Share on other sites

We have a Girard tankless water heater that came with the motorhome when we bought it. I would NEVER have another one in any subsequent RV! Although I've learned to live with it, I hate it, particularly when I'm taking a shower and it continually goes from hot to cold. If it could be done or done at a reasonable price, I'd change it out for a 6-gallon water heater. We never had problems with any of the tank water heaters we've had.

2014 Winnebago Aspect 27K
2011 Kia Soul


Link to comment
Share on other sites

Thanks for all of the replies and input.


The Precision unit is very nice, but it's twice the cost and I'm sure you get what you do get what you pay for. The new Girard Gswh2 seems to be much improved over the Gswh1. The Atwood, also has a modulating gas valve system. If price was no object, I would get the Precision, but being on a very tight budget and still wanting to upgrade I'm leaning towards the Girard. I live by myself most of the time and I just can't justify keeping 10gal of water hot all of the time. Turning it off doesn't make any sense either because it take so long to heat it up. These are my thoughts though.

Link to comment
Share on other sites

Interesting comments. The water does not take long to heat up in fact if you turn on both the electric and gas it heats fast.

We are never in real cold weather and even when we turn off the tank at night after we are done with dishes, showers the water is still warm in the AM . I do not take long showers or navy showers and have not run out of hot water. The wife takes longer showers but have not heard her scream that the water is cold. After years of Rv'ing we have learned to manage resources. We did investigate tankless hot water for the S&B and the 5th wheel but the systems are expensive and expensive to operate.

Bottom line is it is the individuals $$ and they can spend them as they wish.

Helen and I are long timers ..08 F-350 Ford,LB,CC,6.4L,4X4, Dually,4:10 diff dragging around a 2013 Montana 3402 Big Sky

SKP 100137. North Ridgeville, Ohio in the summer, sort of and where ever it is warm in the winter.

Link to comment
Share on other sites

I noticed how high I set the water pressure on our adjustable regulator has a major impact on how long it takes to run our 10 gallon tank out of hot water. At high pressure I get a great powerful shower, but can use up the whole 10 gallons pretty quick. On lower pressure, Cathy and I could take showers one right after the other without running out.


All we have in the shower is the mixing valve, but I plan to add another valve to adjust the volume to conserve water or turn it on and off for "navy" showers without messing with temperature settings on the mixing valve.


I am following this thread as I figure our 11 year old Suburban is probably going to need replacement in the not to distant future. What is the typical life expectancy?



2001 Volvo 770, Detroit 60 Series, Gen 2 Autoshift

Passenger assist elevator to enter cab - for when we need it, or sell it?

'05 Travel Supreme Select 40 RLQSO 5th wheel

2016 smart car


We started full timing on December 1st 2014

Travel is fatal to prejudice, bigotry, and narrow-mindedness - Mark Twain
Not all that wander are lost - J. R. R. Tolkien

Link to comment
Share on other sites


This topic is now archived and is closed to further replies.

RVers Online University


RV Destinations

Find out more or sign up for Escapees RV'ers Bootcamp.

Advertise your product or service here.

The Rvers- Now Streaming

RVTravel.com Logo

  • Create New...