Excessive water temperature is usually the result of stacking within the water heater. Stacking is the occurrence of various water temperatures layering within the water heater with the hottest water in the uppermost layer. This layering or stacking effect typically occurs during small draws of hot water (typically less than 25% of the storage capacity) which are long enough to create a call for heat on the thermostat, but are short enough not to deplete the stored energy within the tank. Excessive stacking can occur when frequent short to moderate draws are taken in quick succession. During this type of situation, the temperature of the domestic water can approach the temperature of the boiler water.

REMEMBER: All water heaters (direct and indirect) will stack.

Reducing stacking within the tank (Non-Warranty)

-Reduce the boiler operating temperature to 160ºF - 170ºF. This will limit the maximum domestic outlet water temperature during high stacking water usage.

-Raise the thermostat sensing bulb higher in the drywell. This will reduce the frequency of thermostat calls for heat during small draws of hot water. However, it will reduce the quantity of available hot water during a deep draw by delaying the call for heat to the boiler.

-Reverse the boiler side piping. The older installations have the boiler supply at the top of the water heater and return at the bottom. Reversing the piping, supply at the bottom and return at the top will:

a)Result in lower tank stacking by having the hottest boiler water closer to the cooler incoming domestic water.

b)Reduce the effect of “thermal overshoot” after the thermostat call for heat has been satisfied.

c)Provide a more uniform hot water delivery temperature during moderate to deep draws (25% to 100% of the tank’s storage capacity). Reversing the boiler piping will not affect the performance of the water heater.

Install thermostatic mixing valve

-Installation of a thermostatic mixing valve will provide an uniform delivery temperature with minimal regard to water usage.

Recirculation Loop

-Installation of a properly sized recirculation loop not only provides prompt delivery of hot water, but it provides circulation and mixing of the water within the tank.

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Weil-McLain C-1013 manual Install thermostatic mixing valve, Recirculation Loop
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C-1013 specifications

The Weil-McLain C-1013 represents a significant advancement in hydronic heating technology, designed for residential and commercial applications. With an array of features that cater to efficient and effective heating, this boiler stands out in the marketplace for its reliability and performance.

One of the main characteristics of the C-1013 is its energy efficiency. Designed to meet stringent efficiency standards, the C-1013 utilizes a variety of innovative technologies to ensure that minimal energy is wasted during operation. This aligns with modern demands for eco-friendly heating solutions, making it a popular choice for those seeking to reduce their carbon footprint.

The boiler is constructed with durable cast iron sections, ensuring long-lasting performance and superior heat retention. Cast iron is known for its excellent thermal conductivity, allowing the C-1013 to provide consistent and uniform heating throughout the space. This robust build contributes to the unit's longevity, as cast iron is less prone to wear and tear compared to other materials.

In terms of heating capacity, the C-1013 is offered in a range of sizes, allowing it to meet a variety of heating demands. Whether for a small home or a larger commercial facility, there is a model that can accommodate specific requirements. Additionally, the boiler is compatible with various heating systems, including radiators and baseboard heaters, offering flexibility in installation.

The C-1013 also features a user-friendly control system, which allows for easy monitoring and adjustments. With digital controls, users can easily manage temperature settings and monitor system performance. Advanced safety features, including high-limit temperature controls and automatic blow-off valves, enhance the boiler's reliability and ensure safe operation.

Furthermore, Weil-McLain emphasizes serviceability in the C-1013 design. The boiler includes access points for easy maintenance and repairs, ensuring that technicians can quickly perform necessary tasks, minimizing downtime and maintaining efficiency.

To summarize, the Weil-McLain C-1013 is a cutting-edge hydronic heating solution, characterized by its energy efficiency, durable cast iron construction, versatile sizing options, and user-friendly controls. With its commitment to reliability and innovation, the C-1013 represents an excellent choice for both residential and commercial heating needs, reflecting Weil-McLain's reputation for quality in the heating industry.
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