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Old 02-10-2012, 02:50 PM   #15
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I think they all require a fan to drive the turbine heater. Would love Lewster's response however. He has far more expertise in this stuff than me.
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Old 02-10-2012, 02:59 PM   #16
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I think they all require a fan to drive the turbine heater. Would love Lewster's response however. He has far more expertise in this stuff than me.
Ah, so they differ from home models... or perhaps they compare to home models that vent horizontally. If I recall correctly, the horizontal-venting version of the Noritz residential unit required forced ventilation, but the vertical-flue version I had installed has no fan.
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Old 02-10-2012, 03:21 PM   #17
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I am sorry if this thread is slightly highjacked...

I can only give reference to the PT unit. It currently vents horizontally through a door similar to Atwoods. It comes in painted or unpainted aluminum so the vintage crowd can polish it up. They are coming out with a new version that will vent down so no side hatch is needed. They do make a combo unit that heats both the space and water. That one does vent down through the floor. A new water only unit is coming out and it will vent down through the floor also.
I brought up PT because I thought they were bought by Atwood(not trying to start rumors if it is false). I thought perhaps they were working together on this.
I too am looking to learn from this thread. Always hoping to see the newest greatest mouse trap....
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Old 02-10-2012, 03:24 PM   #18
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I have no experience with tankless water heaters but I am interested in the technology and the practical application it brings. I wonder about the noise that a burner of that size will make during the heating cycle ???? I picture it being like a jet turbine winding up to produce that much heat quickly. Lookin forward to hearing from those that try it out. I do hope it proves to be a nice upgrade .
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Old 02-10-2012, 04:57 PM   #19
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As far as I know.............

............Atwood has NOT bought Precision Temp. Actually, Aqua-Hot almost bought them a couple of years ago, but decided to develop their own LP fired hydronic heating unit in house.

The noise from a tankless water heater is roughly the same as that from a regular LP unit. The tankless units that I have seen have a large LP burner located at the bottom of the heat exchanger (usually copper), with copper water piping soldered to the heat exchanger. The water heats as it flows thru the copper tubing and exits the unit at the pre-determined temperature.

This final water temperature changes with the temperature of the supply water; colder inlet water gives lower hot water temps as these (and most) tankless units have a set amount of degree rise that they can impart to the incoming cold water. This temperature rise is also a direct function of the flow rate of the water passing thru the heat exchanger (think GPM).

The Girard tankless unit relied on the flow rate to control the exit temps of the hot water, a feature that I found much to the dislike of many of my clients.

Still haven't seen the new Atwood unit, but might be ordering one next week. I'll keep this thread posted if I do.
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Old 02-10-2012, 05:15 PM   #20
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I gather from other comments that the tankless variety consumes less gas than a conventional water heater over a given period of time; however is the differential sufficient enough to recapture the cost differential over the life of the product?
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Old 02-10-2012, 05:17 PM   #21
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Thanks Lewster, I for one an VERY interested in these units.

I wanted to say I think the burner on my 6 gallon Atwood is actually louder than the on demand unit. The burner really pushes the gas through the tube creating a load roar, where as the on the demand is a very low rumble.
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Old 02-10-2012, 06:55 PM   #22
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Thumbs up I am reminded....

If it ain't broke....fix it 'til it is.
--------------------------------------

The LPG savings, how long to recoup $, could be interesting.

We shut down at night...still very warm and usable next morning=0 consumpt 8-10hrs.

Once hot.... never noted it running more that 10-15min every couple hrs= who knowz?

anyone bothered to calqulate?

whooz run out of P-pane 'cuz of a thursty WH?

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Old 02-10-2012, 07:34 PM   #23
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My son-in-law has a camp in the Adirondacks with a tankless water heater. It works great when you turn the water on and leave it on full blast to take a shower - but if you just want a bit of warm water to rinse a glass or wash your hands the tankless water heater leaves a bit to be desired. The secret is to turn the water on full blast and wait a bit for the hot water to start flowing - then turn the flow down. This, even though the unit is no more that 15 feet from the kitchen or bath. The unit is about three years old, propane fired and, in spite of his tweaking it, he hasn't been able to effect much of a change in performance. Because he's off the grid, and running on a combination of batteries, solar, generator and propane, I don't believe the unit even has an electrical connection - other than whatever might be required for ignition.
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Old 02-10-2012, 08:33 PM   #24
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Price differentials are less than you think. (depending on your perspective, of course )

Suggested retail for a 6 gallon Atwood DSI water heater with electric option is $746 while the 45,000 BTU Atwood tankless heater is $949. Do they use less LP than a conventional water heater, DEFINITELY!

When I had my '06 19CCD, I had the Precision Temp unit in it and would not empty the 2 standard 30# LP tanks during a 4 month summer trip with 2 L-O-N-G showers a day. Don't forget, you only use LP when you are using hot water. Even for a bit of water for dish washing, etc....... the unit only runs for a few minutes.
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Old 02-10-2012, 09:24 PM   #25
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New Atwood tankless heaters...

I'm very interested in this thread as a possible replacement/upgrade for my current heater. The size sounds perfect. Venting issues could be a deal breaker on some installs but I like the thought of through the floor venting. As a benefit the fuel and weight savings could easily offset the initial cost of the unit. Would also help if the vintage vent (such as on my trailer) could be left in position for air flow as well as exterior look. Hope you (Frank and Lew) will keep us updated as to performance as well as problems with the new Atwood units. Thanks, Ed
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Old 02-12-2012, 11:07 AM   #26
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Originally Posted by 62overlander View Post
I believe that Atwood now owns Precession Temp. I might be wrong about that.
Frank... this might explain where you got that idea -

"Atwood licenses Precision Temp technology to create a slightly less expensive heater than the PT" - quote Steve Hingtgen of Vintage Trailer Supply
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Old 02-12-2012, 11:33 AM   #27
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In the '90's when I was remodeled a bathroom and replacing our water heater, I looked into a tankless water heater. They use less fuel and don't run out of hot water for those 4 hour showers we all like (in the latter case they would use a lot more fuel). The stopper was that I would have had to install a much larger vent and that wasn't practical at that point.

Perhaps these RV units are different, but maybe the discussion of a fan to move air faster indicates these need more exhaust ventilation than the tank units. If they fit in the same space at the OEM units, I guess they vent out the side too.

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Old 02-12-2012, 11:45 AM   #28
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Referring back to an earlier question, how much of a current draw is there for the instant ignition? Not a fan for parasitic loads when boon docking...

And how exactly do you winterize them? Is there anything to drain out?

Another thing to add to the list of future toys...

Tom
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