Where can i download the manual for a thermor water heater?

I would look on there wed site to see if you can down load a manual in Pdf . You will need to check with makers if this converts some models will not . You could change it the find it does not work on LPG.

Hot water heaters boilers THERMOR Premium PRO 15 OPRO15 221076 boiler

Run it through Bing transulator and you will se a link at the bottom that says installation.

www.reliancewaterheaters.com/lit/spec/2006ServiceHandbook.pdf

1) Copy following links:
http://www.plumbingsupply.com/elements.html
http://waterheatertimer.org/How-to-replace-water-heater-element.html

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

Water heater is not 100% identified.
Unknown if this is gas or electric heater.

Problem posted under Whirlpool water heaters typically made by American water heater company.
Call Whirlpool 877-817-6750.
They will ask for model number and serial number located on label on side of tank.
Call is answered in USA by trained person who can answer specifics about that model, including warranty, age, regular maintenance, error codes, and possible solution for that specific model and serial number.
I have found these folks to be helpful.

Whirlpool manuals do not show that specific model:
http://www.whirlpoolwaterheaters.com/support/manuals.aspx

If you have the energy smart electric water heater with electronic control board, then error code explanation shows on the control board. Error 1 or a single flash, is start-up failure and requires tank to be full of water. Read page 10 of manual. Make sure water heater is full of water and water is coming full stream out of tub spout before turning on power. Also disconnect power from unit, make sure water heater is full, and then reconnect power to see if unit resets.
http://waterheatertimer.org/Whirlpool-Energy-Smart-electric.html
http://www.whirlpoolwaterheaters.com/downloads/6510306.pdf

Instructions for relighting pilot on Tankless water heater are in the product manual:
Model number is on label located on side of unit.
Open following link to help identify product and download possible manual:
http://waterheatertimer.org/Troubleshoot-Bosch-Tankless-water-heater.html

For tank-type water heater, the lighting instructions are usually printed on side of tank in addition to the product manual.

Find the model number and re-post question with as much information as possible for more assistance.

I do not have specific answer.

Open following links to identify product, download service guide and download manual for the different model numbers, plus parts list and other resources:

Page 3-4 of following manual shows switch settings for LP gas.
On-line manual can be word-searched for 'switch.'
This water heater has remote switch, which is the switch you are talking about. It also has limit switch and ECO (energy cut-off switch)
http://waterheatertimer.org/pdf/Atwood-installation-maintenance.pdf

http://waterheatertimer.org/pdf/Atwood-Water-Heater-Service-manual.pdf
http://waterheatertimer.org/Atwood-water-heater-resources.html

When having a problem with pilot and burner, the place to start is troubleshoot section in your manual.
Whirlpool is probably made by Craftmaster which I believe is a Rheem company, and Rheem makes a number of different models.
Some models have specific manuals and others have generic manuals.
Open Rheem water heater page and click on water that matches your water heater. On page that opens, click on tab that says 'specs' and then download manual.
http://www.rheem.com/Products/tank_water_heaters/gas_water_heaters

If none of those water heaters look like yours, open following link to help identify company website and download manual. Craftmaster website does not have instruction manuals.
http://waterheatertimer.org/Water-heater-manufacturers.html

All gas water heaters require periodic maintenance.
Some require yearly maintenance.
The burner parts require cleaning.
http://waterheatertimer.org/images/Clean-burner-300.jpg
http://waterheatertimer.org/images/Clean-burner-250.jpg
http://waterheatertimer.org/How-to-install-gas-water-heater.html

You posted under Rheem gas water heater.
GP can be gallons-per-minute
I believe you have tank-type gas water heater from description of gas valve:
Information is on label on side of tank showing Brand, type, BTUs, model number, and serial number.
Gas valve information is located on side of gas valve:
http://waterheatertimer.org/images/04128.jpg

Since water heaters vary widely, the best place to start troubleshooting is manual for your specific model.
Open following link to identify product. Click on water heater that looks like yours, and next page has pdf files where you can download install-operation manual.
http://www.rheem.com/Products/tank_water_heaters/gas_water_heaters

Search pdf for the word 'ON' or 'gas control'
In any case the manual should be digested fully to gain understanding of your specific water heater.

Once you identify product, re-post question on fixya or the tank, with link to manual, to see if more information can be gleaned from experts and professionals

Also post a photo of your gas valve for possible identification by expert:
http://www.fixya.com/support/r6568559-post_photograph_fixya_questions_answers

Find age of water heater using serial number
http://waterheatertimer.org/pdf/WaterHeaterSerialNumberDecoder.pdf

If you have Rheem tankless: open following link:
http://waterheatertimer.org/Troubleshoot-Rheem-Tankless-water-heater.html

Add a comment for more free help.
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.

I have two C85 Rinnai and one is turned off because it leaked... the other one does not heat water... I have it set on 120.
Where can I download a repair manual on these? I am in Nicaragua and dealer wants to replace them or something.