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Hi Stan, Bladder tank water systems are very reliable "if" there installed correctly. There not made to go through heat/freeze cycles tho and that"s where your having your biggest problems. I would build a above ground 4ftsq building and super insulate that. There"s nothing wrong with 12" walls or 18" walls for that matter then use a 100w blub on a thermostat set at 40șon 45șoff. It all depends on how well you stop the thermal heat transfer in the walls and ceiling on how much external heat will be required for your area. You may not need any external heat. You can also use dirt, dirt/cement, paper, in the walls for insulation or build the walls out of ram earth, dirt/cement, cement/sand, to keep costs down. Both methods will last well over 30yrs if done correctly. Empty bladder tanks need to be set at 2psi below pump kick on pressure to last a long time. Anything higher will suck the bladder out of the tank on each pump cycle thus rubbing a hole in the bladder causing it to fail. T_Bone
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