Tankless hot water heater

B

bd5av8r

New member
Aug 25, 2010
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Hi all!
What are the thoughts on tankless hot water heaters? Do the Jims sell them?
what models are recommended for a GMC? I like to have hot water through the
entire shower, and they are portable in size, so I thought why not.

Has anyone here used them and what are the thoughts on them?

Sammy
GMCless for now. :)
 
bdub attached the link to my tankless water heater installation. This is by far one of the best upgrades we've made to our coach.
 
Sammy,
also in my opinion it was one of the best upgrades I've done.
I went with the Girard brand about 4 years ago. Unlimited hot water is definitely the way to go! But I think everyone is making them nowadays.
I also changed out the shower hand held faucet to a house model and took out all the water restrictures. The hand held faucet also has multiple
settings so if I'm stopped at a overnight without hookups I can still shower in the morning on the low flow setting.

Enjoy! Scott
--
Scott Nutter
1978 Royale Center Kitchen, Patterson 455, switch pitch tranny, 3.21 final drive, Quad bags, tankless water heater, everything Lenzi.
Houston, Texas
 
Thanks, all!! :)

> Sammy,
> also in my opinion it was one of the best upgrades I've done.
> I went with the Girard brand about 4 years ago. Unlimited hot water is
> definitely the way to go! But I think everyone is making them nowadays.
> I also changed out the shower hand held faucet to a house model and took
> out all the water restrictures. The hand held faucet also has multiple
> settings so if I'm stopped at a overnight without hookups I can still
> shower in the morning on the low flow setting.
>
> Enjoy! Scott
> --
> Scott Nutter
> 1978 Royale Center Kitchen, Patterson 455, switch pitch tranny, 3.21 final
> drive, Quad bags, tankless water heater, everything Lenzi.
> Houston, Texas
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>
 
I followed Ray's example almost to the T, although I removed the existing Propane RV refrigerator that did not work, and basically remodeled that
cabinet so I could put in a couple shelves and a small "dorm room" refrigerator. I rarely if ever Boondock, so it made sense for me.

Here are some photos what I did.

So far it has worked great. Takes a little getting used to on flow, etc., but much better than having a tank.

Brian

http://www.gmcmhphotos.com/photos/member-galleries/p64059-water-heater-install.html

(Sorry, again, for the unrotated photos).
--
Brian K
1977 Eleganza II, TZE167V100261
Bellevue, WA
Rebuilt 455, New brake system, a lot of Original Equipment ready to fall apart (discovering more as I go along....)
 
On the other hand, SHE's not likely to use ALL the tank water if the hot
water goes way before then. :-)

Ken H.

> I
> ​...
>
> So far it has worked great. Takes a little getting used to on flow, etc.,
> but much better than having a tank.
>
 
I watched this subject being discussed over the Past several years and
wondered why folks don't use the engine driven hot water feature in many of
our OEM style hot water tanks. in other words use 180-210 hot water from
engine coolant to heat water in the hot water tank fitted with a HEAT
EXCHANGER. My Wife and our family sailed on the Great Lakes for about 18
years and had no lack of Hot water. Sailors are conservative bunch so we
became accustomed to dealing with "dry camping" life style. Would always
run the Diesel engine for 30 minutes each day and always had hot water for
dishes and showers. (Navy Showers)

If your hot water tank is not fitted with the heat exchanger option you owe
it to your self to check it out!
See:

https://www.walmart.com/ip/Kuuma-120V-Front-Mount-Water-
Heater-with-Heat-Exchange/33982683?wmlspartner=wlpa&
selectedSellerId=2132&adid=22222222227022531264&wl0=&wl1=
s&wl2=c&wl3=40970775992&wl4=pla-78913532192&wl5=9012200&
wl6=&wl7=&wl8=&wl9=pla&wl10=113146354&wl11=online&wl12=
33982683&wl13=&veh=sem

FROM APPLIED GMC SEE: http://www.appliedgmc.com/prod.itml/icOid/518
--
Regards,

Tom Pryor
4188 Limerick Dr
Lake Wales, Fl 33859
Cell 248 470 9186

Living on a waterfront is not a matter of life or death. Its more
important than that.
 
Tom,

To answer why not, sometimes I dry camp for several says without moving
coach, so engine heat is not good option. Same for electric only water
heater.
Also don't want to run engine or sometimes generator just to heat water,
especially when already have propane on board. Hence when came time to
replace water heater, seemed liked the best was to replace with tankless
heater.

Fay Curtis
Kneeland, .ca
76 Glenbrook

> I watched this subject being discussed over the Past several years and
> wondered why folks don't use the engine driven hot water feature in many of
> our OEM style hot water tanks. in other words use 180-210 hot water from
> engine coolant to heat water in the hot water tank fitted with a HEAT
> EXCHANGER. My Wife and our family sailed on the Great Lakes for about 18
> years and had no lack of Hot water. Sailors are conservative bunch so we
> became accustomed to dealing with "dry camping" life style. Would always
> run the Diesel engine for 30 minutes each day and always had hot water for
> dishes and showers. (Navy Showers)
>
> If your hot water tank is not fitted with the heat exchanger option you owe
> it to your self to check it out!
> See:
>
> https://www.walmart.com/ip/Kuuma-120V-Front-Mount-Water-
> Heater-with-Heat-Exchange/33982683?wmlspartner=wlpa&
> selectedSellerId=2132&adid=22222222227022531264&wl0=&wl1=
> s&wl2=c&wl3=40970775992&wl4=pla-78913532192&wl5=9012200&
> wl6=&wl7=&wl8=&wl9=pla&wl10=113146354&wl11=online&wl12=
> 33982683&wl13=&veh=sem
>
> FROM APPLIED GMC SEE: http://www.appliedgmc.com/prod.itml/icOid/518
> --
> Regards,
>
> Tom Pryor
> 4188 Limerick Dr
> Lake Wales, Fl 33859
> Cell 248 470 9186
>
> Living on a waterfront is not a matter of life or death. Its more
> important than that.
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>
 
That is good information, however my usage of a GMC will be off the grid
and the unit still for up to a week or so. The hot water heater will have
the duty to run without engine assistance.

Sammy
 
Sammy Williams schrieb/wrote
> That is good information, however my usage of a GMC will be off the grid
> and the unit still for up to a week or so. The hot water heater will have
> the duty to run without engine assistance.b

Instead of LPG, I'll be using gasoline utilizing Eberspächer Hydronic
B5WS connected to the coolant circuitry in my 23' - heats the engine
with a coolant to air heat exchanger, and the water with the original
coolant to water exchanger.

--
Best regards

Peer Oliver Schmidt
PGP Key ID: 0x83E1C2EA

'76a Eleganza II 26', VA
'73 Sequoia 23', Germany, SH
 
While the engine coolant heated hot water is nice, remember that it is much hotter than typical house hot water. Also, if you have one, pay attention
to those long hoses. A break will cost you an engine. Don't learn the hard way like I did. If you are not using this function, install cut-off valves
in both lines and turn them off. Better yet, replace those 40 year old hoses.
Tom

--
2012 Phoenix Cruiser model 2552
KA4CSG
 
One way to think about this is that the tankless water heater is only using propane when the water is running.....and really, how often is that?? Not
very much.

Just another thing I've done, we do mostly boon-docking. So I built what I call a "water wagon". We go and fill it at the pump or water station,
wheel it back and connect it to the city water connection and I have a plug on the side of the coach for the 12vdc power for the pump. I host a
primitive campground every summer for 5 weeks and this makes my resupplying of water a piece of cake.

Water Wagon.....
http://www.gmcmhphotos.com/photos/g6747-water-wagon.html
 
Ray,

You are one CLEVER BUGGER as we say Downunder!

Regards,
Rob M.
The Pedantic Mechanic
Sydney, Australia
AUS '75 Avion - The Blue Streak TZE365V100428
USA '75 Avion - Double Trouble TZE365V100426
USA '77 Kingsley - TZE 267V100808


-----Original Message-----
From: Gmclist [mailto:gmclist-bounces] On Behalf Of Ray Erspamer
Sent: Thursday, November 30, 2017 9:16 AM
To: gmclist
Subject: Re: [GMCnet] Tankless hot water heater"

One way to think about this is that the tankless water heater is only using propane when the water is running.....and really, how
often is that?? Not
very much.

Just another thing I've done, we do mostly boon-docking. So I built what I call a "water wagon". We go and fill it at the pump or
water station, wheel it back and connect it to the city water connection and I have a plug on the side of the coach for the 12vdc
power for the pump. I host a primitive campground every summer for 5 weeks and this makes my resupplying of water a piece of cake.

Water Wagon.....
http://www.gmcmhphotos.com/photos/g6747-water-wagon.html

_______________________________________________
GMCnet mailing list
Unsubscribe or Change List Options:
http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
 
Thanks for the cautious words. The coolant hoses are all new, and all I add to the original install is the gas powered heater up front and the water to air on the coolants way back to coolant to water heater near the bath.
--
Best regards

Peer Oliver Schmidt
'76a Eleganza II, VA
'73 Sequoia, Germany
 
> On the other hand, SHE's not likely to use ALL the tank water if the hot water goes way before then. :)
>
> Ken H.

That is a lot like my thinking about wanting a noisy water pump. But having had a young life with only the potable water we had in the tank did leave
an impression.

Matt
--
Matt & Mary Colie - '73 Glacier 23 - Members GMCMI, GMCGL, GMCES
Electronically Controlled Quiet Engine Cooling Fan
OE Rear Drum Brakes with Applied Control Arms
SE Michigan - Twixt A2 and Detroit
 
But, there is another problem that was demonstrated catastrophically by a friend with an hunting cabin, it could easily happen in a coach installation
as well.

Any on-demand single pass direct fired heater has to have good outside access to vent combustion by-products (exhaust). If you have a simple system
that heats for water demand only and the outside temperature falls below freezing. The water heater can be frozen a damaged. (Well, in this case
destroyed. His cabin now has an automatic dump that opens when the system is idle in cold weather.

The plan is good, but not all situations can manage a good installation.
Dan Greg's idea was a good one except for the freezing part.

Matt
--
Matt & Mary Colie - '73 Glacier 23 - Members GMCMI, GMCGL, GMCES
Electronically Controlled Quiet Engine Cooling Fan
OE Rear Drum Brakes with Applied Control Arms
SE Michigan - Twixt A2 and Detroit
 
Oliver, how many BTU's is that unit? You have room for it up front under the hatch? Shift the batteries to the drivers side I'd guess?
Hal
--
1977 Royale 101348,

1977 Royale 101586, Diesel powered,

1975 Eleganza II, 101230,

1974 Eagle Bus 45',w/slideout,

Rio Rancho, NM
 
On the standard GMC layouts, there's plenty of room behind the refrigerator for it and then there is the roof vent for the water heater venting.
 
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