Let’s turn back the hands of time to the 1970s, and gather round you youngsters born after 1980 because you’re not going to believe what mechanical contractors faced while fighting to keep their vehicles gassed up and on the road to service customer’s needs.
Suppose I was to tell you there exists a tankless water heater you could install on the hardest of hard water that would never, ever have to be descaled and that its heat exchanger’s water pathways would look almost as clean as the day it was born.
That was my friend and competitor’s response after he asked me to determine why a recent radiant heating installation was not working satisfactorily because the owners were ticked off.
For you younger tradesfolk who have entered into a mechanical career within the past 20 years, you may never have encountered PB (polybutylene) tubing and fittings.
As a designer/installer of any hydronic radiant system (especially one that incorporates hydro-air, old preexisting standing cast iron radiators and an indirect water heater), you have dozens of steps involved that are not unlike setting up a winding row of dominoes.
Mmanufacturer of air-to-water heat pumps called asking if I would be willing to visit a home to perform a heat loss/gain calculation where two of its heat pump systems had been installed and determine why the home was not heating and cooling to the homeowners satisfaction.