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Here are my experiences with 12V and 115V pumps

1) 12V Shurflo 1.8gpm 60psi. Weakest pump I have used. Painfully slow, does not draw well or shoot very far.

2) 12V Shurflo 1.5gpm 150psi Good pump. Good for decks, fences, trim around houses, small touch up roofs jobs while washing a house, pumps well through 200ft 3/8" hose. Too slow for entire roofs.

3) 115V Shurflo 3.3gpm 50psi. Ok pump, I used it a little while for roofs, much faster than 1.8 but I started getting into electrical problems, it kept shorting out, and tripping the breakers on customers houses when it got wet.

4) 12V Flojet 4.9gpm 40psi. Great pump, holds up very well, lasts a long time and another big difference going from the Shurflo 3.3gpm.

5) 12V Delavan 5.0gpm 60psi. As of 2007, the best 12V pump I have owned. 2007 technology provides performance unheard of with 12V pumps. Again another step up from the 12V Flojet.

6) 12V Delavan 7.0gpm 100psi. The current king of all 12V pumps. Performance actually rivals gas powered chemical pumps.

For serious full time roof cleaning, get an air diaphragm pump with an air compressor.

12V Delavan pumps operate best with wire is short as possible and thick. I use 10 gauge wire for my FATBOY 7gpm pump and a strong car battery 770CCA/950CA.

http://www.pressurewasherproducts.com/Chemical_Pump.html





-- Edited by Roof Cleaning Pro Greensboro NC (336)362 7659 on Saturday 13th of March 2010 07:53:13 PM