Articles by John Siegenthaler, P.E.

Why don’t North American indirect tanks have larger heat exchangers?

In an attempt to avoid purchasing what he considers “fancy valves,” an installer constructs the system shown with globe valves.

How to extract more heat from a storage tank.

Mounting solar panels at the proper angle is critical in maximizing system performance.

The hydronic system shown was intended to provide heat to a radiant floor slab and an indirect water heater.

Using wood-fired heat sources in conjunction with conventional fuel.

A homeowner tells his installer that he wants a geothermal heat pump as well as a mod/con boiler to supply the radiant floor heating in his new home.

A possible operating mode for some hydronic systems.

After 30 years, it was time for a solar refresh.

The proper application of pressure-independent balancing valves.