I'm installing a tankless water heater (150lbs static load, 10" deep)
I only have one option for installation and it is a 2x3 framed wall with 24" centers.
The Top bracket is designed to mount on top of a horizontal crossmember with screws penetrating the cross member in four locations and the studs in two. The bottom bracket requires a cross member as well but it just bolts to the cross member.
My question is this. What is the best way to install this right (without rebuilding the wall). Double jack studs would work if the actual dimensions were 2x3, which they are not. Should I just add another stud inside and work off of that?