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buffalobillpatrick · 02-24-16, 08:37 PM

Mobile Master Tech, thanks for update, you are right KISS, simple is better.
But, IMHO zone pumps use too much power.

I agree with Mikesolar, he really knows what he is talking about.

My Son's new 3400ft2 house (I designed the heating system) has 6 heating zones using Taco Sentry zone valves (low power).

All flow in the 10,000'+ pex distribution system is done with 1 Grundfos Alpha ECM pump set on the lowest constant pressure mode (6' head) (very low power).

Slow flow (.5 GPM) in each loop uses only 29% of the pumping energy needed at 1 GPM (when flow is doubled head loss goes up by 3.4X)

but here is the surprise: it delivers 96% as much heat.

02-24-16, 08:37 PM	#534
buffalobillpatrick Master EcoRenovator Join Date: Mar 2014 Location: Florissant, Colorado Posts: 599 Thanks: 814 Thanked 59 Times in 55 Posts	Mobile Master Tech, thanks for update, you are right KISS, simple is better. But, IMHO zone pumps use too much power. I agree with Mikesolar, he really knows what he is talking about. My Son's new 3400ft2 house (I designed the heating system) has 6 heating zones using Taco Sentry zone valves (low power). All flow in the 10,000'+ pex distribution system is done with 1 Grundfos Alpha ECM pump set on the lowest constant pressure mode (6' head) (very low power). Slow flow (.5 GPM) in each loop uses only 29% of the pumping energy needed at 1 GPM (when flow is doubled head loss goes up by 3.4X) but here is the surprise: it delivers 96% as much heat.