Question about Bosch 1600H-LP Liquid Propane AquaStar AquaStar Liquid Propane Tankless Water Heater

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My 1600H-LP is freezing up. I installed it with the advertised option of direct vertical venting (5" class B vent pipe) from the basement, up past the 1st floor, thru the attic and out the roof. The unit works great. The problem is when its below freezing out, the unit freezes up. I've had to shut off the water and stuff a towel up the exhaust on cold nights...what a pain. How can I alleviate this without buying a power vent kit?

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6ya6ya
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Posted on Jan 02, 2017

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keemo68
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SOURCE: Bosch 1600H-LP Overheating Problem

did you check to see if your temp regulater is working properly? also you have a thermocoupler that senses the heat of the water and works in conjunction with the regulator. have either one or both replaced and the problem will be solved. please rate this thanks

Posted on Sep 02, 2008

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SOURCE: I purchased an aqua star 1600h-lp to be installed

I would say that the wood fire/stove must have a heck of a draw to affect the bathroom heater. Maybe a separate air supply from outside via a pipe,to the stove meshed off against vermin would decrease the problem. Plus it could stop cold air being sucked across the room from an outside door.
Downdraft through the heater could happen with either vertical or horizontal vent. More important is the direction of the prevailing wind [horizontal] ingress of water/snow etc [vertical]
We often use the separate air supply in the UK and if the pipe bore is large enough 4" plus it seems to work ok.

Posted on Mar 20, 2010

cosmos196
  • 8 Answers

SOURCE: Problems with bosch 1600h ng tankless wh igniting

I found that the solution to my issue of not igniting was due to a bad pilot electrovalve part #8708501249. It was about a $50 part that was bad from the start.
Really disappointing that Bosch's QA would let a such a defective part ship. I spent about 3 years of using a workaround with a fan blowing air to get ignition until it finally failed. I had a tech look over the system to point me in the right direction.

Posted on Dec 23, 2012

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1 Answer

Have 75 gallon gas water heater. Can I run 90 PVC off top power vent without vertical PVC first? Have Richmond unit.


1) I believe you can immediately elbow the PVC pipe.
There is a limit for how many elbows can be used between blower and termination, and limit is determined by diameter of PVC pipe.

2) Copy following link for venting resources and typical Rheem and Richmond power vent manuals, and diameter-elbow pdf from Bradford White.
http://waterheatertimer.org/How-to-troubleshoot-gas-water-heater.html#venting

3) Richmond is Rheem. Product manual will show specifications for venting.
Product warranty is voided if installation does not follow specifications shown in manual.

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How do you insulate a tankless water heater for winter


If you have tankless electric, it can simply be insulated... but tankless electric are seldom mounted outdoor.
Service bulletin says: "the only way of assuring protection is to completely remove the heater during those times the area may experience freezing temperatures.

There are tankless with built-in heater for exterior installation.
Check your manual, or add a comment with specific model number and maybe I can find the information.

Here's why they install tankless outdoors: Because tankless burn more fuel per gallon of hot water. This requires larger gas line and larger vent pipe than typical tank-type gas water heater that is usually installed indoors.
They install tankless outdoors, so there is no need for expensive vent pipe, and because there is ample incoming air to support combustion.
So if tankless does not have factory-installed internal heater, then the unit can freeze easily when the combustion draws in cold air.
Of course you can put heat-tapes on the pipes but the heat exchanger inside will quickly freeze during periods when hot water is not being used, and combustion is not taking place.

You can move the tankless installation inside and use correctly-sized vent and intake pipes directly through the wall. This will generally protect tanklesss from freezing if room is heated adequately.

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Bought a used lp gas heater stove for living room.need istructions with pictures on how to install the vent. did not come with a manuel and unable to find info needed on website. this is an Empire Cast...


Hi,
You have this posted under the Z-vent heading... is that the make pipe that came with the stove, and if not, what vent pipe came with the stove... we need to know which pipe it is exactly to be able to help you best...

heatman101

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1 Answer

Size of the exhaust vent pipe on a 75 gallon gas water heater? Is it the same size as on a 50 gallon water heater. Brand is GE, mfg 2008


I believe it takes 4" vent pipe up to 100,000 BTU
BTUs are shown on label side of tank.
http://waterheatertimer.org/pdf/Gas-venting-specs.pdf

Does new water heater have power vent? What does manual say?
Are you experiencing vent problem now? When you light a match and put it under vent stack, does smoke immediately get pulled upward? Are furnace and waster heater connected to same venting. Is there dark exhaust stain around vent hood? Does exhaust vent back out of vent hood when furnace kicks on? Are flue pipes stained with rust and white coating? Are vent pipes vertical, or are there level runs? Are the pipes made of galvanized and screwed together with 3 screws at each joint?

Frankly I would double-triple-check any internet answer dealing with possible CO poisoning at your home.
1) Ask local plumber for specific code in your area.
2) Call gas company
3) Post question on pro water heater forum:
http://www.thetankatwaterheaterrescue.com/forums/forum3/
4) Read whole manual for new water heater before buying.
5) Contact manufacturer.

Add a comment with your experience so others with same-similar problem can benefit.

Also take advantage of fixya expert assistance live.
For a price, expert works with you while you work on water heater or any do-it-yourself project.
Fixya is always less expensive than a service call.

Mar 30, 2011 | Water Heaters

1 Answer

I purchased an aqua star 1600h-lp to be installed in a cottage. Question is, the cottage is heated with a large wood stove/fireplace. The water heater is located in a bathroom at the other end of the...


I would say that the wood fire/stove must have a heck of a draw to affect the bathroom heater. Maybe a separate air supply from outside via a pipe,to the stove meshed off against vermin would decrease the problem. Plus it could stop cold air being sucked across the room from an outside door.
Downdraft through the heater could happen with either vertical or horizontal vent. More important is the direction of the prevailing wind [horizontal] ingress of water/snow etc [vertical]
We often use the separate air supply in the UK and if the pipe bore is large enough 4" plus it seems to work ok.

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2 Answers

Can I Use Existing Venting from Old Water Heater?


The only thing is I think the vent pipe foe the tankless is smaller than 5".I think the one I install was a three inch.

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Venting of Bosch 2400es in the basement


Yep they make gas pipe for that .Lowes should have it.

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No hot water


Aquastar 1600H NG Natural Gas Tankless Water Heater Bosch AquaStar Model 1600H NG Natural Gas Whole house tankless gas water heater, 117,000 Btu input, natural draft with hydro-generated ignition. Provides endless hot water for one major application at a time . Can replace 40-gallon storage tank water heater. Optional Accessory: Model AQ1- Power vent with built-in... More freeze protection when venting horizontally. Capacity: 1 to 2 Bathrooms Dimensions: 8.75D x 18.25 W x 29.75H Weight: 40 Max GPM @ 45F Rise: 4.2 Energy Factor: NG .80 LP .84 Minimum Input: 28,000 Maximum Input: 117,000 Vent Size: 5 Gas Connection: 3/4 Water Connections: 1/2 Warranty: 12-year warranty on heat exchanger, 2-year on parts Features: Endless hot water Can save up to 50% off utility costs annually Perfect for one major application at a time No standing pilot, hydro generated

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