> 5,000 gallon subterranean tank. ...about 19,000 litres. That seems like tremendous overkill. Are you also planning on using that for home heating? If not, it

> 5,000 gallon subterranean tank. ...about 19,000 litres. That seems like tremendous overkill. Are you also planning on using that for home heating? If not, it seems like a very large maintenance burden for anything other than some kind of survival scenario.