cityclean
New Member
I am trying to pre-heat my incoming water by circulating it through a tank that holds my drain water. I have not purchased anything yet so design size is up in the air. I am looking for a 400 - 1000 gal tank to store the waste water (110-120 deg F). I have an Incoming 1-1/2" line (40 psi & 40-50 deg F). The more pre-heat I can put into this water the less my boiler has to work to give me 160 deg F wash water. What I am thinking is running the incoming line throught the waste water tank but I do not know how long the line has to be to give me the proper surface area to get the most heat exchange I can get. I have looked into buying some 3/4" tube and making my own header. Or buying some pre -finned tubes. Please let me know if you have any ideas