Water Heater Install – Vent out side of house – Safe?

So I've been shopping for a new water heater for about 3 months... i really would like to order one ASAP. I've spent hours reading manuals, and just finished speaking with 2 different installer companies, the manufacturer and the vendor.. none of them would give me an answer. So here I am. I will be getting ALL of my work reviewed by a licensed installer before actually using the unit.

Current setup:

40 gallon natural gas water heater - flute moves over 30" then goes direct up in a dual walled flute through to the roof. This seems to be the normal way of doing it in my area.

Want:

relocating to corner of house (no chimney right now) 60 gallon gas water heater - direct vent - non powered unit will have flute move across about 36" and will have about 40" of rise. I want to vent out of the side of the house rather than putting in a new chimney.

Essentially the flute would go > straight out top of water heater > immediate 90 degree turn to horizontal> straight(ish) horizontal for 30ish inches > 90 degree turn to vertical (up to main level) > 90 degree turn to horizontal (out to the exterior of house) > 90 degree turn to vertical > vent cap on top

This is the unit I was looking at:

https://www.homedepot.ca/product/rheem-rheem-performance-platinum-60-gal-gas-water-heater-with-12-year-warranty/1000792889

I like dealing with home depot because my fam had one break at 11 years and they replaced it no problems.

I was comparing it to this unit here:

http://www.gsw-wh.com/en/products/direct-vent

this unit doesn't seem to have any issues with venting out the side, and I was wondering if I can essentially do the same thing with the rheem 60 gallon and a similiar 90 degree vent.

I'll add that non one in my area was really familiar with venting a NON powered water heater out of the side of the house, is there another issue I should be concerned about?

Forgot to add, I'm in Ottawa, ON - cold climate winter / hot humid summer.

My current water heater is 22 years old

Is this idea safe with the 60 gallon water heater?

Would this install (which also has an additional vertical + horizontal elbow) be safe with the GSW 50 gallon? (rather than manufacturer who shows it just venting straight out)

Some photos of my current setup:

https://imgur.com/kPsoQgG https://imgur.com/zqJWlTs https://imgur.com/4yJ2oQK

xposted from HVAC as it wouldn't let me do it normally.

See the original post here:
Water Heater Install - Vent out side of house - Safe?