Do you have your heart set on the Landa brand? How about a HydroTek Heat Link, available 120 or 12 volt.
CPHL4 - 4 GPM, 3,500 PSI, 120 volt - List $2,395.00
CPHL6 - 6 GPM, 3,500 PSI, 12 volt - List $2,995.00
CPHL8 - 8 GPM, 3,500 PSI, 120 volt - List $ 3,195.00