Question about Bosch & Tankless LP Hot Water Heater

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Need teeny, tiny O-rings for old AquaStar 125S LP. Any suggestion

Bosch doesn't carry parts for AS's built before they bought AquaStar so I've been looking all over for 2 very small O-rings that go inside the pilot ignition assembly. I've tried auto parts stores, welding supply & others but they all have them same "kits", which the smallest is the right "OD" but too large "ID". I need about as small as tip on regular old cheap ink pen. Thought of medical supply repair folks but can't find any. I'm even willing to buy something just to dismantle it for O-rings if I knew they'd fit.

Help, cold showers are no fun at all, especially in winter.
Thanks for any thoughts or ideas...

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Did you try a well stocked plumbing supply house not a real big sale for him so you might have to tell him you may need like 1000 of them to motivate him to look

Posted on Apr 15, 2009

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Posted on Jan 02, 2017

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Bosch aquastar 125b


Thermocouple which on that model can be just the Thermocouple or a larger loom with the thermocouple in it depends. Call or look up Houseneeds.com they have parts.
If it was the magnet you wouldn't get any gas to manually light pilot.

Jun 06, 2014 | Water Heaters

1 Answer

Pilot light works but no flame. Somehow, think it overheated due to stoppage of water flow at sink.


Before calling service technician, open following links for Bosch troubleshooting resources:
http://waterheatertimer.org/Troubleshoot-Bosch-Tankless-water-heater.html
Resources at Bosch
http://www.boschhotwater.com/HelpfulResources/TechnicalSupport/BoschAquaStarModels/tabid/370/Default.aspx
Typical Bosch Aquastar manual:
http://waterheatertimer.org/pdf/Bosch-aquastar-170vp-manual.pdf

All tankless and tank-type gas water heaters require regular cleaning and maintenance.
It is unknown if your unit needs maintenance or repair parts, but catching up on maintenance using information from manual is good place to start.
Gas appliances are increasingly complicated and experienced technician is good resource to have in local area before installing tankless.

Apr 16, 2011 | Bosch AQ125BO LP AquaStar 4.3 GPM Outdoor...

1 Answer

I have a 250SX aquastar Bosch tankless hot water heater . It keeps going out on EC code; whats wrong? Also I've been running the unit for about a 9 months without hooking up the condensate dain line.


The 250 MUST have the condensate line connected. EC comes from gas supply problems and CO2 levels not being adjusted. LP units require 3/4" smooth gas pipe or 1" corrugated pipe minimum size. The LP regulator needs to be turned up to about 13 inches of water column and with all the gas appliances on, measure no less than 11 inches of water column. The CO2 levels must be measured by a qualified gas technician with a calibrated (with in 6 months) CO2 analyzer.

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1 Answer

Bosch Aquastar 2400E LP Does Not Heat Water


Sounds like the water flow sensor and servo, may just need cleaning, get it checked out by a Bosch agent

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Recently installed a Bosch 2700ES. I am getting


unplug power or turn off power,reboot, and try again

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1 Answer

Tubing size


Absolutely not. Unless it is installed exactly as instructed you will have a problem. Too small of a line = reduced flow rate.

Please rate if this helps-

Mar 23, 2009 | Bosch 1600H-LP Liquid Propane AquaStar...

1 Answer

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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