The past several years have brought forth a new generation of technology in the hydronics industry. With European hydronic design influencing the marketplace, there's suddenly a most awesome array of European boilers, indirect DHW tanks, controls, PEX piping systems, thermostatic valves, radiators and specialty tools and hangers available to plumbing, radiant or HVAC contractors.
I confess to being a Europhile wethead. I know there are more ways to create superb hydronic systems using products and techniques beyond those discussed here. My intent is to focus on what has worked best in my experience with our business and our customers. Please don't feel offended if I've left out your favorites. You may be right about them.