Just wanted to introduce myself. My name is Eric and have been reading this forumn for a few months now.I find it very helpful.I recently purchased a used WoodGun E 180. I am a union fitter/welder and inspected the boiler very carefully before I bought it. The boiler is 22 years old and its integrity is amazing.It's an all carbon steel unit. It is A.S.M.E. certified and has oil backup and a dhw coil. I have a question on storage. As far as stratification goes.Is it better to have the tanks(in my case) installed verticle or horizontal.Im thinking verticle but really have zero experience with this. Also I will be using 4 120 propane tanks 30 inches in diameter and 48 inches long.I plan on cutting them in half and welding them back together too make two tanks-roughly 480 gallons. Twinned together through a simple manifold.My house is roughly 1700sf. The insulation is good to fair.Wondering if anyone has anything similiar.My heating system is oil fired base board. Just trying to get some ideas on what my volume of storage should be and and if the tank being placed vert or horz has any bearing on effeciency.