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ALPHA1 & 2 Circulator Pumps Information

The ALPHA Series represents the modern evolution of circulator technology. These pumps use ECM motors, advanced control modes, and intelligent algorithms to deliver the right flow at the right time. Whether the system is a small residential loop, a large multi‑zone manifold, or a domestic hot‑water recirculation system, there’s an ALPHA model designed for it.

Why ALPHA Pumps Exist

Hydronic systems today are more dynamic than ever. TRVs open and close throughout the day, zone valves cycle frequently, and boilers modulate their firing rates. Traditional fixed‑speed pumps can’t adapt to these changes, leading to noise, wasted energy, and uneven heating. ALPHA pumps solve these problems with pressure modulation, AUTOADAPT logic, and ECM efficiency.

ALPHA 15‑58 — The Residential Standard

This model is the ECM replacement for UPS‑style pumps in small and medium hydronic systems. AUTOADAPT automatically selects the right pressure curve, making it ideal for zone valves, TRVs, and boiler loops. Bluetooth connectivity through the Grundfos GO app simplifies setup and troubleshooting. It’s quiet, efficient, and well‑suited for most residential heating systems.

ALPHA1 26‑99 — When the Boiler Is in Charge

Some boilers and building management systems want direct control over pump speed. ALPHA1 26‑99 is built for these applications. It requires a 0–10 VDC signal and delivers high head and flow for larger circuits. It doesn’t include AUTOADAPT or internal control modes — it simply does what the boiler tells it to do.

ALPHA2 26‑99 — Large Circuits, Smart Modulation

For larger hydronic loops, ALPHA2 26‑99 provides the performance needed to maintain stable flow. AUTOADAPT adjusts pressure automatically, making it ideal for TRV systems, large manifolds, and primary loops. Stainless SU versions are available for potable water applications.

ALPHA HWR — DHW Recirculation with a Return Line

ALPHA HWR is designed for domestic hot‑water recirculation systems that already have a return line. It uses temperature control, timers, AUTOADAPT, vacation mode, and disinfection cycles to deliver hot water efficiently and safely. It’s quiet, low‑power, and built with potable‑approved materials.

ALPHA Comfort System — DHW Recirculation Without a Return Line

For homes without a return line, the ALPHA Comfort System uses a bypass valve under the sink to create a temporary recirculation path. The pump mounts at the water heater and uses temperature‑based control modes to deliver hot water quickly without major plumbing changes.

Bottom Line

The ALPHA Series is the right choice when efficiency, comfort, and system stability matter. Whether the system is controlled internally, externally, or through usage‑pattern learning, there’s an ALPHA model designed to handle it.