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If it can, then it is done with dip switch settings.
Read your product manual.
Switching types of gas, and messing with dip switches is dangerous.
LP gas burns much hotter than NG, and LP pressures are much higher than NG
Call Rheem with serial number and they might supply the information to you, but will likely tell you to call service technician... leaving you in exact same spot you are in now. http://waterheatertimer.org/Troubleshoot-Rheem-Tankless-water-heater.html
Call a qualified service tech immediately. Gas explosion indicates dirty combustion parts, and gas is not fully igniting when tankless turns on the gas. So gas builds up and then explodes causing serious damage to tankless, and serious risk to homeowner.
Tankless are complex electronic machines. If on-site plumbers cannot figure out problem, then you need trained service technician with a service manual for your specific product, who can ohm-test the electronics. Bosch will have a list of trained service technicians. And maybe Bosch has another step for fixing problem yourself.
Tankless require yearly maintenance as outlined in manual. No tankless manufacturer suggests do-it-yourself repairs on their product, in part for liability and danger to customers, but for long-term customer satisfaction. Repairs and yearly maintenance will eliminate the $1-8 monthly energy savings expected from owning tankless.
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I was looking for a service manual, which you apparently do not supply. I was not looking for someone who will charge me a fee to get information. I can get that info directly from Bosch for free. Thank you for answering. John
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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