Bradford White Combi Core 1 vs Combi Core 2

[Brad79]

I'm looking to install one of these in my home still under construction. The cost to rent are either $39 for the Combi 1 or $50 for the Combi 2 (I'm in Canada).

I'm not quite sure I understand the need for the double wall which appears to be the only difference in the two tanks. I mean, why would BW manufacture a product that would fail? Should I get the 2? Is there any other benefit?

The two systems are here: http://www.bradfordwhite.com/products/power-vent-dedicated-heat-exchanger

Thanks!

 

[Reach4]

http://www.bradfordwhite.com/defender-safety-system®-and-non-defender-combi2™-ttw®-power-vent-system says

The double wall heat exchange coil also provides added protection, required by certain municipalities, against the mixing of potable water and space heating fluid.​

So a benefit to the double wall is that it is required by some municipalities. Maybe you had seen that.

In that case, your question probably is what is the likelihood of a failure of the heat exchanger mechanism, and what is the probable danger as a result. You will put non-toxic antifreeze solution in the space heating lines.

Another question would be which is more energy efficient.

I don't know the answers to those. I am not advocating either way.

 

[Sponsor]

 

[Brad79]

http://www.bradfordwhite.com/defender-safety-system®-and-non-defender-combi2™-ttw®-power-vent-system says

The double wall heat exchange coil also provides added protection, required by certain municipalities, against the mixing of potable water and space heating fluid.​

So a benefit to the double wall is that it is required by some municipalities. Maybe you had seen that.

In that case, your question probably is what is the likelihood of a failure of the heat exchanger mechanism, and what is the probable danger as a result. You will put non-toxic antifreeze solution in the space heating lines.

Another question would be which is more energy efficient.

I don't know the answers to those. I am not advocating either way.

Thanks. I did see that part about 'certain municipalities.' That's not an issue where I live.