High Efficiency ECM “Smart” circulators!
The pump on the right is a variable speed ECM circulator which varies its speed automatically based on load (how many zones are calling). It varies between 5 and 43 watts while the standard circulator on the left is a steady 80 watts. I always included these new low consumption circulators for the heating zones but now due to the recent price drop and instant rebate, we include them even for the intermittent/constant load zones like the hot water zone you see here. Half the electricity of a standard circulator. Easy payback.