Below is a little bit of background of what we have as well ideas I have been pondering for a while now to try and defeat old man winter here in South Dakota. Spring is trying to break free and it is time to go to work. I am hoping for input as to whether or not these ideas will work or not, or how I might go about getting the same results in an easier fashion. We have an off grid property, which we are hoping to be moved onto full time next spring (2020). Currently the property has a thousand gallon septic tank installed. A great water well, with a single hydrant is located inside a plastic prefab, un-insulated garden type shed about 100 yards away from the well. Inside this same shed is a 35 gallon barrel used as a water holding tank, a 2.8 GPM water pump, a deep cycle battery, a small pressure tank, and an older model Bosch tankless propane water heater. The water is pumped from the well to the hydrant using a gas generator and stored in the holding tank. The water is moved from the holding tank into the cabin via the water pump, which is powered by the deep cycle battery (re-charged via 45 watt solar panel from Harbor Freight), through the small pressure tank, and through the tankless propane water heater. All of the water lines from the holding tank to the inside of the trailer are completely exposed to the elements at this point. We have a propane tank, which is used to power the tankless water heater, refrigerator, cook stove, and vented wall mounted heater. The "cabin" as it were, is a converted 48 foot reefer semi-trailer, which has been turned into a living quarters complete with full bathroom, kitchen, sitting, and sleeping area. Our living space is enlarged with a window encased, but un-insulated (for now) 12x32 three-season porch. The trailer is not on any type of foundation and sits at the normal height of a trailer as the wheels, tires, and landing legs are still intact and positioned on large re-used bridge planks and short adjustable jack posts to keep it from settling. Neither the trailer nor the porch is skirted or insulated with anything at this point, but they will be prior to moving in. The plan is to move into the trailer and reside in it until we get our permanent cabin built, which we are looking forward too, but which could take us a while building by ourselves. During the summer months, when we spend time working at the property, there is no problem with the water and tankless heater set up as it is. The winter time, however, brings a different set of chores and challenges. We have to drain the entire system each evening to keep the exposed lines from freezing. If the weather is bad enough, we don't even hook the system up and instead fill 5-gallon buckets from the hydrant to meet our water needs. Not a deal breaker, but not ideal either. The old tankless water heater was not properly cared for by the prior owners and runs hot and cold, which really impresses the wife to no end. One of her "must haves" prior to calling this place our permanent home until the new cabin is built is to have a new and improved propane tankless water heater in place and working before making the move. Of course, I'm thinking about how I can set up a system to keep the water lines from freezing all together and not having to drain them every night throughout the winter. With all of that being said, I am thinking of removing the prefab water shed, re-locating the water hydrant underneath the trailer and building an insulated concrete block structure below frost level depth(4 foot) up to the underside of the trailer, which when finished would be approximately 7 foot in height. Also inside the structure would be the holding tank, water pump, small pressure tank, and the main water line running into the trailer from the pressure tank to a new tankless water heater. This water line would be insulated and have minimal exposure to the freezing air. Being encased in an insulated block structure below frost level should also assist in keeping things thawed out as well, at least in my minds eye. I am also thinking of re-locating all of the hot and cold water lines to the inside of the trailer from the tankless water heater. It may be somewhat unsightly having them exposed, but I will camouflage them as best I can. It will only be for a year or so right? We heat our in town home with a wood stove and will be bringing it with us when we move to the off grid property. Because of this, we will not have any more need for the propane wall mounted heater. I am thinking I will mount the tankless water heater about where the wall heater is currently located and vent it through the wall. Okay, that's about all for now. Let me have some feedback, good, bad, or ugly truth.