On 2/17/2019 7:38 PM, croy wrote:
On Sun, 17 Feb 2019 04:07:23 -0600, Alan Holbrook wrote:

The water pressure in my domestic hot water supply has recently dropped to
very low levels.

Think about the difference between pressure and flow-rate.

Is your complaint really about pressure? Or is it about flow-rate? If it's about pressure,
what pressure have you measured?

If you measure the pressure, and it's 40 PSI or more, pressure is not your problem--something
is restricting the flow. Flow can be restricted, but pressure cannot--it can only be allowed
or not allowed.

99% of the questions about water pressure are really flow rate. Once
the valve is opened, pressure drops considerably no matter the flow. I
bet the static pressure is the same on hot and cold but the hot is flow
restricted.