Benefits of the Delta-T Bumble Bee

  • ECM motor cuts electrical consump-
    tion by up to 85%

  • Taco's exclusive Delta-T technology boosts that savings by 15 to 19 times

  • Maximizes boiler efficiency, reduces short cycling

  • Matches flow to actual heating load

  • Guarantees the best performance of any system you install or upgrade

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Curve 101



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Smart contractors are picking the smartest pump.

The contractors you see here are just a handful of the thousands of professionals who know a good thing when they see it: the ECM variable speed Bumble Bee.


Made for American systems.

American hydronic systems are based on Delta-T, the actual temperature differential between supply and return. We designed the Bumble Bee® to take optimal advantage of that fact. The result is a very smart pump that delivers infinite variable speed for profound system efficiency.


Unmatched system performance.

While other "smart" ECM pumps simply count the number of open zones and pump a pre-set speed to maintain system pressure (ΔP), the Bumble Bee reacts to how many zones are open and how cold it is outside. It pumps ONLY the BTU's needed to match the actual heat loss (ΔT). The entire system runs at peak efficiency every day with no boiler short cycling. Your customers are more comfortable and they're saving electricity PLUS fuel – lots of it!

Flexible and easy to install.

We don't just think of your customers, we think of you, too. The Bumble Bee features a bright digital display, universal swivel flange, and a wide open terminal box. It's details like these that make the Bumble Bee the first choice for a painless and top-notch job every time.


360° Swivel Flange for universal fit-up
The industry is noticing the Bumble Bee! Read the articles and watch the videos! Click the links below or the photos above.


Andy Mickelson:

Dave Yates:

John Abularrage:

Richard Swatton:

Kline Residence:


Learn more about Delta-T