Taco ECM pumps

DC123

This probably betrays considerable ignorance of circulators, but the Taco 007e and VR1816 seem like similar pumps if you're using them as the pump on a secondary loop with zone valves. (if it matters, assume for the purposes of this question two zones of 3/4" copper pipe with about 70 feet of fin tube per zone). Any reason you would choose one over the other?

Leon82

The 1816 will run in a few modes. Constant pressure for one. And variable speed which you can fine tune

The 007 has one speed and curve as far as I know

Constant pressure is good for zonevalves

Robert O'Brien

No advantage to 1816 in that application

SWEI

Price.

sunlight33

Which mode of operation on the 1816 is ideal for a two-zone baseboard system (w/o TRV)?

SWEI

Assuming those zones are controlled by valves, I would generally choose constant pressure mode. Check the ΔT while the boiler is firing on a cold day, exercise the zone valves and see how it behaves. Adjust head as necessary to produce desired results.

DC123

So I guess the question is, if the constant pressure setting on the 1816 is preferred for zone values, but the 007e is fixed speed, doesn't that imply that the 1816 should be the preferred circulator in this setting?

DC123

Ah, that was the source of my confusion. Thanks!

Robert O'Brien

With a zone valve application, the 007e is the same. Take a look at the pump curve.