On Sun, 16 Mar 2008, Bubba wrote:

Don Wiss asked:
So, what is the most efficient 50 gallon tank water heater with the longest
tank warranty? The run would be about 40 feet and will have a bunch of 90
degree bends.

You forgot the Vertex Power Vent water heater at 90% efficiency

Hi Bubba,

Okay. I see that I missed it. And it clearly stands at the top (for
residential heaters). I find for venting:

• 2" pipe, vents up to 25 equivalent feet
• 3" pipe, vents up to 65 equivalent feet
• 4" pipe, vents up to 128 equivalent feet

What are "equivalent feet?" Or how many feet does a right angle count as?

Don www.donwiss.com (e-mail link at home page bottom).

P.S. For those curious as to what Bubba and I are discussing:

http://www.ho****er.com/products/res...rg-vertex.html

Instructions: http://www.ho****er.com/lit/im/media...197423-002.pdf

Spec sheet: http://www.ho****er.com/lit/spec/res...RG-SS01306.pdf