Home » Public Forums » GMCnet » [GMCnet] Tankless HW Heaters
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| Re: [GMCnet] Tankless HW Heaters [message #356067 is a reply to message #356062] |
Thu, 25 June 2020 09:51   |
Carl S.
Messages: 4186
Registered: January 2009
Location: Tucson, AZ.
Karma: 13
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Senior Member |
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It looks like you'd have to cut a hole in the side of your motorhome to accommodate this unit. If you have a non-GM upfitted coach that already has a hole, that might be fine, but Most of us would be reluctant to cut in a water heater and ruin the clean lines of our coaches.
Carl Stouffer
'75 ex Palm Beach
Tucson, AZ.
Chuck Aulgur Reaction Arm Disc Brakes, Quadrabags, 3.70 LSD final drive, Lenzi knuckles/hubs, Dodge Truck 16" X 8" front wheels, Rear American Eagles, Solar battery charging. GMCSJ and GMCMI member
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| Re: [GMCnet] Tankless HW Heaters [message #356070 is a reply to message #356062] |
Thu, 25 June 2020 11:25 |
Scott Nutter
Messages: 782
Registered: January 2015
Location: Houston/San Diego
Karma: 4
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Senior Member |
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That’s the unit we’ve been using for the last few years. I couldn’t imagine ever going back to the old tank system.. But I’m with Carl, I would hate to cut a hole in the side to install it.. and then you would have to replumb the water lines. Sounds like a lot of work..
Scott
Scott Nutter
1978 Royale Center Kitchen, Patterson 455, switch pitch tranny, 3.21 final drive, Quad bags, Dave Lenzi super duty mid axle disc brakes, tankless water heater, everything Lenzi. Alex Ferrera installed MSD Atomic EFI
Houston, Texas
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| Re: [GMCnet] Tankless HW Heaters [message #356509 is a reply to message #356062] |
Tue, 07 July 2020 18:50 |
GatsbysCruise
Messages: 261
Registered: January 2017
Location: Waukegan, Illinois
Karma: 3
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Senior Member |
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From what I have seen, most installs of the propane on demand HWH's is in the Refer ventilation shaft. Seems a big job to me, with removal of the refer to install.
The GMC HWH is ok, and unique with the heating from the engine when you travel.
I have given some thought about an upcoming water system change and have considered small 120v ac hot water tankless demand units. They would fit under the sinks.
Depends on what you want or demand, which ever works for you.
GatsbysCruise. \
74GMC260 Former Glacier Model style. \
Waukegan, Illinois \ Keep those MiniDiscs Spinning \ MY GREYHOUND IS FASTER THAN YOUR HONOR ROLL STUDENT \ WindowsXP-Win7-Win8.1-UBUNTU STUDIO - UBUNTU VOYAGER - Berzin Auto Center
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| Re: [GMCnet] Tankless HW Heaters [message #356799 is a reply to message #356694] |
Wed, 15 July 2020 11:39 |
GatsbysCruise
Messages: 261
Registered: January 2017
Location: Waukegan, Illinois
Karma: 3
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Senior Member |
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Ah you seem to have a couple of interesting concerns.
First, the tankless water heaters will build up mineral deposits over use. Using park water that may be highly mineralized, would speed that process up. The fix is you have to periodically use a chemical to remove or disolve the minerals from inside you tankless water heater. THE PROBLEM IS, the minerals in the water will flow into the tankless water heaters tubes and are attracted to the heat. with each use, the mineral build up continues. over time you will see less performance from the water heater because the minerals will insulate the water from the heat.
First thing to remember is most RV furnaces are ineffecient. I read an article where there were complaints about the fan never shutting down while in a heating cycle. This generally happens because the air flow is restricted so the temperature in the coach never gets to a point where the heater can shut down and the fan can time off.
There are different senarios to this problem but, I read somewhere, I believe it was here on GMCnet, that the air flow restriction is in the heaters plenum. or where the heated air goes before it is routed through the coach ducting. Most cases the duct is small and the routing requires the air to make a 90 degree turn before forced out through the ducts and into the coach.
One fellow mentioned a fix was to remove the cover to that plenum where the hot air would blow straight out from the plenum into the room. The room would warm up, the thermostat would shut down, the fan would time out and shut down until heat is called for again.
The fan uses a good amount of power, and running all night will use all the power in your battery. The fan must have down time to help conserve the battery power.
Many won't use the furnace for that reason. It can be a real watt buster and will stop working when you need it.
The alternative is to get a propane ventless heater. Many like them, some do not, it is the users decision if this is good for you.
The operation of using a propane ventless heater is always have ventilation, a window cracked open to allow fresh air in. Also have a Carbon monoxide alarm working.
These heaters come with thermostats and CO cut offs if the carbon monoxide level should get too hi, but learn proper use and how to safely use them.
The amount of Propane used is less than that of the normal coach furnace because residual heat is not expelled out the exhaust vent.
If you are only a Camp Ground camper, pick up a nice safe electric heater and use it when you are parked and plugged in to park power. Very safe and works well.
My old RV had a heater in the roof Air Con unit. It is said to be just for chasing the chill in the rv. I spent the night in a campground when the temp outside got down to about 32 degrees. That roof AC heater kept the coach warm, around 70 degrees. I actually added a thermostat to that heater because it could actually get too warm inside.
slc
GatsbysCruise. \
74GMC260 Former Glacier Model style. \
Waukegan, Illinois \ Keep those MiniDiscs Spinning \ MY GREYHOUND IS FASTER THAN YOUR HONOR ROLL STUDENT \ WindowsXP-Win7-Win8.1-UBUNTU STUDIO - UBUNTU VOYAGER - Berzin Auto Center
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| Re: [GMCnet] Tankless HW Heaters [message #356806 is a reply to message #356799] |
Wed, 15 July 2020 13:42 |
richshoop
Messages: 190
Registered: April 2017
Karma: 0
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Senior Member |
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Be VERY careful when using an electric heater in the coaches, the wiring can be damaged by using heavy loads. You can use the 750 watt size electric heater, no problem.
> On 07/15/2020 9:39 AM slc via Gmclist wrote:
>
>
> Ah you seem to have a couple of interesting concerns.
>
> First, the tankless water heaters will build up mineral deposits over use. Using park water that may be highly mineralized, would speed that process
> up. The fix is you have to periodically use a chemical to remove or disolve the minerals from inside you tankless water heater. THE PROBLEM IS, the
> minerals in the water will flow into the tankless water heaters tubes and are attracted to the heat. with each use, the mineral build up continues.
> over time you will see less performance from the water heater because the minerals will insulate the water from the heat.
>
> First thing to remember is most RV furnaces are ineffecient. I read an article where there were complaints about the fan never shutting down while in
> a heating cycle. This generally happens because the air flow is restricted so the temperature in the coach never gets to a point where the heater
> can shut down and the fan can time off.
>
> There are different senarios to this problem but, I read somewhere, I believe it was here on GMCnet, that the air flow restriction is in the heaters
> plenum. or where the heated air goes before it is routed through the coach ducting. Most cases the duct is small and the routing requires the air to
> make a 90 degree turn before forced out through the ducts and into the coach.
>
> One fellow mentioned a fix was to remove the cover to that plenum where the hot air would blow straight out from the plenum into the room. The room
> would warm up, the thermostat would shut down, the fan would time out and shut down until heat is called for again.
>
> The fan uses a good amount of power, and running all night will use all the power in your battery. The fan must have down time to help conserve the
> battery power.
>
>
> Many won't use the furnace for that reason. It can be a real watt buster and will stop working when you need it.
>
> The alternative is to get a propane ventless heater. Many like them, some do not, it is the users decision if this is good for you.
>
> The operation of using a propane ventless heater is always have ventilation, a window cracked open to allow fresh air in. Also have a Carbon monoxide
> alarm working.
> These heaters come with thermostats and CO cut offs if the carbon monoxide level should get too hi, but learn proper use and how to safely use them.
>
> The amount of Propane used is less than that of the normal coach furnace because residual heat is not expelled out the exhaust vent.
>
> If you are only a Camp Ground camper, pick up a nice safe electric heater and use it when you are parked and plugged in to park power. Very safe and
> works well.
>
> My old RV had a heater in the roof Air Con unit. It is said to be just for chasing the chill in the rv. I spent the night in a campground when the
> temp outside got down to about 32 degrees. That roof AC heater kept the coach warm, around 70 degrees. I actually added a thermostat to that heater
> because it could actually get too warm inside.
>
> slc
>
> --
> GatsbysCruise. \
> 74GMC260 Former Glacier Model style. \
> Waukegan, Illinois \ Keep those MiniDiscs Spinning \ MY GREYHOUND IS FASTER THAN YOUR HONOR ROLL STUDENT \ WindowsXP-Win7-Win8.1-UBUNTU STUDIO -
> UBUNTU VOYAGER - Berzin Auto Center
>
> _______________________________________________
> GMCnet mailing list
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| Re: [GMCnet] Tankless HW Heaters [message #356836 is a reply to message #356067] |
Thu, 16 July 2020 03:19 |
Ken Burton
Messages: 10030
Registered: January 2004
Location: Hebron, Indiana
Karma: 10
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Senior Member |
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The fan is controlled by a heat sensor in the heat exchanger. When the heat exchanger cools down (and the gas valve is not energized), then the fan shuts off. The propane gas valve is controlled by the thermostat. If someone has a fan running all the time they need to fix their furnace.
I am keeping my gas furnace. I have never killed a battery running it.
I also have a spare furnace that someone from Florida gave me. They claimed they never needed it.
Ken Burton - N9KB
76 Palm Beach
Hebron, Indiana
[Updated on: Thu, 16 July 2020 03:23] Report message to a moderator |
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