A big thanks to the Champion Plumbing crew.
We swapped two old inefficient gas water heaters that had flues running up our fireplace for two new High-Efficiency Power Vented gas water heaters. Wow, what a difference it made. Not only can we now remove the flues and use the fireplace again, but the water just stays hot even when They (not naming names) have used all the water for hour long showers. It doesn't last forever, but it really is great.
Champion did a great job and kept the house clean while doing it. They kept me informed of what they were doing and there were NO Hidden charges at the end. Thanks Champion.