I would like to convert my water heater and boiler system to natural gas

With knowledge of make and model, your manufacturer can supply a retailer who can provide you with proper kit...
info here...
http://www.propane101.com/lpgasapplianceconversions.htm

http://hometips.me/Mar/Convert-water-heater-to%20different-gas.pdf

Sears com

Contact Rinna
Some water heaters allows changeover by installing new chipboard or changing dip switches... some do not.
Propane burns much hotter with higher pressure than natural gas
Gene

Water Heater Timers Save Money

If you need further help, I’m available over the phone at https://www.6ya.com/expert/gene_9f0ef4df2f9897e7

Rheem water heaters should not be converted from propane to natural gas. The burners have been optimized for the rated gas and will not work as well after conversion. (Unlike ranges where the gas/air flow ratios can be adjusted when the burner orifices and regulator are swapped, the water heater doesn't have that option.)

I wish I had better news for you. I recommend you get a new water heater for the LNG service; it will be safer and more efficient.

Cindy Wells

This unit operates as a boiler- and need ANNUAL service to clean the unit by flushing with a demineralizing solution ( Vinegar or CLR) If no maintenance is done it will accumulate minerals and corrosion which eventually cause unit failure. T the least the unit will operate at reduced efficiency

no.
propane burns much hotter than natural gas, and has higher pressure
gas valve and burner and orifice must be changed to switch between natural gas and propane
http://waterheatertimer.org/How-to-troubleshoot-gas-water-heater.html
Most manufacturers do not support converting gas on heater.

Gene

If you need further help, I’m available over the phone at https://www.6ya.com/expert/gene_9f0ef4df2f9897e7

Before calling service technician, open following link for Bosch tankless troubleshooting resources:
http://waterheatertimer.org/Troubleshoot-Bosch-Tankless-water-heater.html

Fix most tankless problems do-it-yourself, same day any brand, for $317
http://waterheatertimer.org/How-to-install-gas-water-heater.html

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This unit cannot be converted from gas type to gas type.

what size of gas line is going into boiler and water heater? is it black iron ? natural gas or propane? have you checked gas pressure at water heater and furnace ? if they work fine individually then you have a problem with incoming gas pressure. Call gas company and ask them if they would come out and check gas pressure.

Hi Jurgie,
I'm Harvey, the Master Plumber,
Happy to render my assistance.

This is your problem!
When you are switching on the boiler it ignites for 8 to 10 seconds, then it cuts off and the lock out lamp comes on. Pressing the reset button or turning on the hot water tap has the same effect.

I need to get the make and model of your specific boiler to give you an accurate answer!
Waiting for your response.
Harvey, your Master Plumber.