Weil McLain, 381300000, Electric Aquastat
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Weil-McLain 381-300-000 Electronic Aquastat with Integrated Low Water Cut-Off
The Weil-McLain 381-300-000 is an OEM electronic aquastat designed for use in hydronic heating systems requiring both temperature control and low water safety protection. This unit combines high and low temperature limit settings with an integrated low water cut-off (LWCO) circuit, providing both operational control and equipment protection in a single assembly.
This model is engineered for compatibility with select Weil-McLain boiler systems and is suitable for field replacement or OEM installation in systems utilizing immersion well-based temperature sensing.
Functional Capabilities
- High Limit Temperature Control: Adjustable from 100°F to 220°F for regulating boiler water temperature.
- Low Limit Temperature Control: Adjustable from 110°F to 200°F, commonly used for maintaining boiler standby temperature.
- Integrated LWCO: Shuts down burner operation when water level is insufficient, enhancing system safety.
- Anticipator Circuit: 0.2A for thermostat compatibility and response stability.
- Circulator Control: Rated for 5.8 FLA motor loads.
Technical Specifications
- Manufacturer Part Number: 381-300-000
- High Limit Range: 100°F–220°F
- Low Limit Range: 110°F–200°F
- Circulator Load: 5.8 FLA
- Thermostat Anticipator Load: 0.2A
- Mounting Type: Immersion well (well not included)
Installation Requirements
This electronic aquastat must be installed by qualified HVAC or plumbing professionals. Proper installation requires connection to a compatible immersion well and system wiring per boiler specifications and local code. Ensure that temperature limits and differential settings are calibrated based on system requirements. Post-installation checks should confirm proper high limit cutoff, circulator activation, and LWCO lockout operation.
Contractor Notes
This unit is designed to streamline boiler control by combining limit protection and low water sensing in a single control. It eliminates the need for separate LWCO wiring and simplifies control panel layout in replacement and new installations. Verify that the existing system supports integrated LWCO logic before installing.
Fast, Reliable Delivery for Every Order
At Primes Distribution, we understand that timely delivery is just as important as product quality. That’s why we partner with trusted carriers to make sure your plumbing, HVAC, and heating supplies arrive safely and on time.
Shipping Methods
We offer multiple shipping options to fit your needs:
Standard Shipping: 3–7 business days across the continental U.S.
Expedited Shipping: 1–3 business days for urgent orders.
Local Pickup: Available at our warehouse by appointment.
Order Processing
All in-stock orders are processed within 1–2 business days. You’ll receive a confirmation email once your order is placed and a tracking number as soon as it ships.
Orders placed after 3 PM or on weekends will be processed the next business day.
Shipping Costs
Shipping costs are calculated at checkout based on weight, dimensions, and delivery location. Large or heavy items (like water heaters or HVAC units) may require special freight handling.
Delivery Areas
We currently deliver throughout the United States. For bulk or international shipments, please contact our support team for a custom quote.
Damaged or Missing Items
If your shipment arrives damaged or incomplete, report it within 48 hours of delivery. Our support team will quickly arrange a replacement or refund.
Need Help?
If you have questions about your order or need help tracking a shipment, reach out to our customer support team at:
📧 sales@primesdistribution.com
📞 786-937-7081
