Ok here it is 1/8 th stainless , L2'xW14" x H3' approx. 52 gallons started this morning and finished about 6pm. picked up pump at a resale shope for $37.00 (awesome) , fittings $39.00 , stainless was left over from another job (free) .I am going to try to get hooked up by next weekend , I am going to work on the heating coil to put inside the heat chamber (not the fire box ) . then just plumb it all out , last months heat bill was $44.00 thats with a week at zero degees and lower , gas hot water tank , oven and gas dryer 2700 square feet of livable space 73 degrees all over the house , this will preheat the supply into gas hot water tank , OK LET ME KNOW WHAT YOU THINK !!!!!!!!!