Hi Frank;
I searched around a bit and found these numbers ) To side wall-33" To rear wall-28" Front-48" Flue pipe-18" Ceiling-54"
They may be good but I doubt your insurance company will accept them.
Then I found this. It may be the same company that dropped the wood stove line.
TECHNICAL SUPPORT
For prompt technical support, please contact our technical support team by sending your inquiries to us at
techsupport@hotwater.com. You can also contact us by calling 1-888-GSW-TECH (479-8324) or by fax at 519-787-5500.
LOCATION
GSW Water Heating
599 Hill Street West
Fergus, Ontario, Canada N1M 2X1
T 519.843.1610
F 519.787.5500