GMX Unit Selection Chart
For Water Only
 
Number of 400's
Required
Number of 800's
Required
Number of 848's
Required
# of 8000's Required
Tubing or Pipe
Single Pass
Fuel
Recirculate or Booster
Single
Pass
(Incoming )
Recirculate or Booster
Single Pass
( Pool )
Recirculate
( Spa )
Single Pass
or Recirculate
1/8"
1
1
 3/16"
1
1
1/4"
1
1
5/16"
1
1
3/8"
2
1
 7/16"
2
1
1/2"
3
2
2
1
5/8" 
2
2
3/4"
2
2
1"
2
2
2
2
1-1/4"
2
2
1-1/2"
4
2
2"
4
2
2”- 4"
4
5”- 6”
6
8" 
8
9”-10”
10
 Above
Consult