What kind of heater is this? Need wiring diagram also

I have a Hayward comfort zone natural gas heater which I am trying to fix. I need to find an electrical schematic but I cant read the model # anywhere.

Does anyone know what model this is so I can find a diagram?

Or does anyone know how this heater functions, it appears to not have an external power source? The heater worked 2 years ago until the pilot tube cracked. I just replaced the pilot assembly and the pilot lights but the main valve wont turn on. There is a small amount of voltage on the wires but I dont know if its enough to open the valve. First I need to know if the system operates on self generated low voltage, and secondly if so, how much voltage?

http://img836.imageshack.us/img836/7123/poolheater.jpg

Uploaded with ImageShack.us

Post a bigger picture, please. If there is a label, photo it.

Also, open the front panel, and see if there is a label on that panel.

The labels inside and out are completely gone, multiple people have tried to read. Hoping somebody has something close sitting in their back yard that they can compare to.

http://img221.imageshack.us/img221/8...0604170313.jpg

Uploaded with ImageShack.us

How much voltage should I have on the gas valve wire to open it? Is it a millivolt system? I have 250 millivolts on it so either I have a bad gas valve or not enough voltage? Any help would be greatly appreciated since currently in Minnesota the highs are in the 50s and my pool is freezing...

Thanks.