Find the Right Circulator Pump: 4 Water Heater and Hydronic Choices Compared

Quick Take

If you're choosing a circulator pump for a water heater or a hydronic heating loop, the first question is what kind of system you're feeding. Two of these pumps are built around domestic hot water recirculation; one is a flanged boiler pump; and one is a straight 115VAC hydronic circulator. The listed prices span from $94.99 to $569.99, with different motor ratings, connection styles, and control options.

• The Grundfos UP10-16APMBU/LC uses an electronically commutated motor and a lead-free brass housing.
• The Grundfos UPS26-99FC is a three-speed pump with a cast-iron body.
• The Bell & Gossett 103401LF is a 1/6 HP 3300 RPM unit listed as New - Open box.

Price Comparison

Decision Matrix

Product Notes

Bell & Gossett 103401LF 1/6 HP 3300 Max RPM 115VAC Circulating Pump

This is the highest-priced option in the group. It's a 1/6 HP, 115VAC circulator with a 3300 max RPM rating, and it carries the Bell & Gossett name. The condition is designated as New - Open box, meaning the unit is new but the packaging may not be intact. If you need a straightforward hydronic circulator with a basic motor spec and don't mind open-box packaging, this is a candidate. The main drawback is pairing the top price with open-box condition.

Grundfos UP10-16APMBU/LC 1-1/4\" Union Comfort Series Circulating Pump

This pump is aimed at domestic hot water recirculation. It uses an electronically commutated motor for efficiency and has a lead-free brass housing. The three automatic control modes-AUTOADAPT, temperature control, and continuous operation-are a strong fit for homeowners who want hot water ready at the tap without running the pump needlessly. The connection is a 1-1/4\" union, so that's the size you'll need to match in your plumbing. The described applications are water heater storage tank systems and water heaters with a dedicated return line, so be sure that's your setup.

New Grundfos UPS26-99FC 115v Water Circulator Pump / Boiler Pump 1/6 HP 52722512

This is the flanged, three-speed choice for heating systems. It has a cast-iron body, a 1/6 HP motor, and a listed max flow of 33 GPM with up to 29 feet of head. The listed applications include radiant heating, hydronic heating, fan coil heating, and solar systems. It comes with two gaskets, and the flanged connection sizes are listed as 3/4\", 1\", 1-1/4\", and 1-1/2\". The connection type is the key compatibility point: make sure your system uses flanged connections.

For Grundfos Hot Water Re-Circulating Pumps UP15-10SU7P TLC 595916 1/25 HP 115V

This replacement pump for Grundfos water system package circulator pumps comes with a built-in timer and line cord, and it's described as non-submersible. The built-in timer is a practical feature for scheduling hot water circulation. The fitment is given as a reference model, so you'll want to confirm your OEM number before ordering. If you want a timer-equipped recirculation pump at the lowest listed price in this group, this is the one to check.

Final Recommendation by Use Case

• For domestic hot water recirculation with automatic control, choose the Grundfos UP10-16APMBU/LC at USD 250.00.
• For a timer-equipped recirculation pump at a lower price, choose the Grundfos-compatible UP15-10SU7P at USD 94.99.
• For a boiler or radiant heating loop, choose the Grundfos UPS26-99FC at USD 325.00.
• For a basic hydronic circulator, choose the Bell & Gossett 103401LF at USD 569.99.