Background: solar run house with generator for water pump and motor. We get our water from a spring branch 150 feet to the west. My last "plumber" put the pipe directly into the branch and that caused all sorts of sediment to come into the house and through the pump and tankless hot water heater. :bash: A few weeks ago I hired a backhoe and we set tile down to a depth of nine feet beside the branch and ran the foot valve into it. So far no problems with this set up but wait! there are other problems. After discussing it with several techs, I determined incorrectly that a 119 gallon pressurized tank would be the best for our use. The tankless water heater ignites on water pressure and needs 30gpm to ignite. Since I wash dishes and shower without the motor running the water pressure is important. Unfortunately 119 gallon pressurized tank only fills with about 20 gallons of water. Can I increase this? I can't do anything about this system right now but I am looking for alternatives if I can't get the pressurized tank to supply enough water. I was thinking that a large water storage tank on legs would be able to hold sufficient water to keep from having to run the generator to run the pump several times a day and it would supply suffiecient pressure by gravity but am worried it would freeze in winter and don't know the cost. I am running a dc shurflo for livestock and outdoor water. And I practice water conservation inside but still find I need more water than I can manage running the pump just twice a day.