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Sizing Calculator

Optimal product size is determined by the temp of your inlet water supply.

inlet water

temp at Zip

72

hot water

heater set temp

110
How many faucets do you use simultaneously. ie. at most my house has 2 sinks, 1 shower running simultanously.
sinks
0
showers
0
appliances
0
total flow rate
0gpm

optimal°

To heat 0.0 gpm, by 110°F we recommend the

Optimal Opti 12

Compare Optis

For each option

option 1
option 2
option 3
flow rate (GPM)
opti 3
- - -
- - -
1 - -
0.5
opti 6
- - -
- - 1
1 - -
1.1
opti 12
1 1 -
1 - 1
3 - -
2.1
opti 18
- 2 -
1 1 1
6 - -
3.2
opti 27
- 3 -
1 1 1
9 - -
4.8
opti 36
- 4 -
1 2 1
13 - -
6.4