Delta T Circulator- Boiler Loop

ChipDryden

I've been reading some literature regarding the taco VT2218 and am curious as to your opinions of replacing my 3 speed "boiler side" circulator w/CST's, on a Primary/ Secondary (with baseboards) system, Lochinvoir NKB 150 Noble. The Knight has a 0-10v reference to control the circulator however the Noble does not. Could the Delta T circulator provide better efficiency? Or, fight with the boilers internal adjustments??????

hot_rod

the Lochinvar Knights all come with an ECM circ that is controlled by the Smart System control. So it modulates with the firing rate of the boiler. Piped as P/S.
I wish they would show a hydro sep stead of just mentioning it 😙

The selling feature is reduced energy consumption from both the ECM technology and the reduced speed. Changing to a fixed speed ECM boiler pump( the green block on the graph) gets you a 50% or more efficiency gain. That is power consumption on the pump, not boiler efficiency increase. If you tracked pump run time and applied your kWh costs, you could determine the $$ saved. If you get an ECM rebate from your power company, it may pencil out to change that circ?

We are close to the day when boilers will ship with ECM. Unless the DOE changes its mind. Again,

ChipDryden

Thanks Hot-Rod, Exactly what I found. What I was pondering is putting a ECM Delta T circ. instead of the UPS 26-99 .Lochinvoir doesn't mention a Delta T circulator as an option in the install manual and I am still in warranty. Looks like an easy swap, but as a homeowner I don't want to screw the boiler.