Tankless water heater instead of conventional heaters for larger system.

[cilyjr]

And it absolutely wasn't my idea either- we all stand on the shoulders of giants. I just wasn't sure if you would recognize the user name!

Were you running off of a boiler or a tankless?

The big difference I believe, would be the tankless could operate as a closed loop for the fluid running through the water heater independently from the house. That's not going to be the same with a boiler, in that case I assume it would work as a zone.