It is literally the new hotness, and as the article says, getting clear info on it can be difficult. Our furnace--a gas tankless combi unit--probably has a few

It is literally the new hotness, and as the article says, getting clear info on it can be difficult. Our furnace--a gas tankless combi unit--probably has a few years of life left in it, but we want to plan for it's replacement, not wait until it fails in the middle of winter. Figuring out how well it will work in our location, with the pipes, radiators, etc, we have, seems to be not straightforward.