After plenty of research, I'm installing a Buderus GB142/30 gas mod/con boiler in my house, replacing an ailing oil-fired boiler. I want to pair it with an indirect HW tank. My HVAC guy initially quoted a Buderus ST150 40-gallon indirect tank, but for roughly the same money he's willing to install a SuperStor Ultra SSU-45 45-gallon tank. His only concern is about connecting the DHW tank sensor from the Buderus boiler to the SuperStor tank.
The 5-gallon gain aside, I have some reservations about the Buderus ST150. While some of the quotes I received followed the "matching" principle of using the same company for both boiler and indirect tank, most quotes paired a boiler with a HTP SuperStor tank. I've seen numerous examples on the Internet of GB142 installations that are paired with SuperStor, not Buderus indirect tanks. The HVAC guy claims this is a result of most installers being more familar and comfortable with SuperStor.
I guess it comes down to the stainless steel vs. interior coating and anode rod debate. While Buderus' Thermoglaze coating is supposed to be the best, most of what I read indicates that stainless is much more preferred. Both have excellent heat loss ratings, with Buderus having a slight edge (1/4 degree F per hour vs. 1/2 degree F per hour for SuperStor). But the possibility of the Buderus coating failing worries me, and I'm bothered by the idea of that I may need to replace a magnesium anode rod at some point. I don't think my town water has a high PH level or contains a lot of chlorine, which I understand can corrode stainless steel. Also, I don't care about having mismatched equipment - I want good quality stuff that will last the longest. So I'm leaning towards the SuperStor.
Any suggestions which way I should go? How much more difficult is connecting a SuperStor to the Buderus boiler than connecting a Buderus ST150?