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Green electronic low water cutoff box with test button

Taco Inc

Taco Inc LFA0243S-1 Low Water Cutoff

SKU CH-1RQJ-QY96F

Electronic low water cutoff protects steam and hot water boilers with foam compensation and automatic reset

  • Electronic control protects steam and hot-water boilers from low water
  • Foam-compensating probe ignores false low-water signals
  • SPDT relay rated 3 A at 120 V AC and 3 A at 240 V AC
  • Automatic reset restores operation once water level recovers
  • NEMA 1 green enclosure with built-in test button

TACO LFA0243S-1 Low Water Cutoff

The TACO LFA0243S-1 is an electronic low water cutoff designed for steam and hot water boilers. It operates on 24V AC power and mounts via NPT threading. The NEMA 1 enclosure protects internal components in standard indoor mechanical rooms. A built-in test button and foam compensation simplify commissioning and ongoing service.

Suits single-switch boiler protection needs

Installers needing a single SPDT switch with automatic reset will find this unit matches the spec. The 3 A relay rating at 120V AC and 240V AC covers typical burner circuits. Systems requiring multiple switch outputs, manual reset functions, or higher contact ratings must use a different control strategy.

Electronic control with foam compensation

The electronic sensing method includes foam compensation to prevent nuisance lockouts on surging boilers. Automatic reset restores operation once water returns to safe level. This specific sensing technology determines suitability for the installation.

How it compares

Measured against everything we stock in Fans, Vents & Climate Control, at today’s prices. Recalculated every night.

Price $181.99
Pricier than about 74% of the 328 comparable items (median $68.99).

Specifications

Product
Brand nameTACO

Questions about this item

How can I confirm the low water cutoff is working after installation?

Press the included test button to simulate a low-water condition; the SPDT contact should change state and the relay will interrupt the burner circuit.

What comes in the box and what must be purchased separately?

The unit includes the electronic low water cutoff with foam-compensating probe and test button; pipe fittings for the NPT connection and 24 V AC control wiring are not included.

Which version should I choose for a 24 V AC steam or hot water boiler?

The LFA0243S-1 is the single-switch, NEMA 1 model rated 3 A at 120 V AC and 3 A at 240 V AC, designed for 24 V AC input on steam and hot water boilers.

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