Choosing between two pump pressure switches from the same manufacturer can be harder than choosing between two different brands, because shared specifications often hide the differences that affect installation and system fit. The EPC-1.1 and EPC-3, both produced by ZHEJIANG MONRO MACHINERY & ELECTRONIC CO.,LTD under the Monro Switch brand, are a useful example. Both are positioned as pump pressure control devices, both carry an IP65 protection rating, and both list a maximum working temperature of 55 °C. For a procurement professional, however, the more relevant question is not which model is generally better, but which model matches the pump system, the intended application, and the connection interface.

Why a model-level comparison matters in pump control sourcing

At the decision stage, buyers usually move from broad questions about pressure control switch suppliers to specific questions about SKUs. This is where identical-looking specification sheets can create confusion. A model that is well suited for a domestic water supply application may not be the natural choice for an irrigation or water-treatment project, even if both models share similar electrical ratings.

The comparison below focuses only on documented product data available for the EPC-1.1 and EPC-3. It does not rank one model above the other. Instead, it gives buyers a simple framework for understanding what the two records actually say, where the models overlap, and where a purchasing decision should be based on application and pipe connection details.

EPC-1.1 and EPC-3 in the manufacturer's portfolio

Monro Switch is the brand used by ZHEJIANG MONRO MACHINERY & ELECTRONIC CO.,LTD, a manufacturer based in Wenling City, Zhejiang Province, China. The company is formally established in 2010 and says it has more than 20 years of manufacturing experience in pressure controls and float switches. Its main product categories are pump controllers, pressure switches, and float switches, with about 90 percent of output exported to Asia, Europe, North and South America, the Middle East, and Africa.

The product portfolio is broad. Monro states an annual output of 2.88 million units for the EPC series, 3.24 million units for the KRS series, and 0.6 million units for the FPS series. The EPC-1.1 is classified in the product record as a pump pressure control, while the EPC-3 is classified as a pump pressure switch. Both belong to the same family, and this is precisely why many buyers ask whether the two can be used interchangeably.

Published specifications at a glance

The table shows that the two models share a large part of their electrical and environmental specification. A buyer who focuses only on voltage, frequency, IP65, and temperature may conclude that the models are near-identical. The differences become clear only when the discussion moves to application field, power range, and connection thread options.

Three differences that matter for a buying decision

1. Listed application field

The EPC-1.1 product record lists the intended industry as Domestic. The EPC-3 record lists the intended industries as agriculture irrigation, water treatment, and construction. This is not a small editorial detail. Distributors and system builders often use these labels to decide which products belong in which inventory category. A residential water supply pump and a project-oriented irrigation pump may have similar control needs, but the commercial context, packaging expectations, and procurement specifications can be different.

For an importer or distributor, the practical implication is that the EPC-1.1 should be considered when the order is aimed at domestic or residential water pump systems. The EPC-3 should be considered when the same type of control is needed for agriculture irrigation, water treatment, or construction-related pump applications. The specification table alone would not make this distinction visible.

2. Maximum power coverage

The EPC-3 adds a 0.55kW maximum power option that does not appear in the EPC-1.1 record. Both models cover 0.75kW, 1.1kW, and 1.5kW, but the EPC-3 also extends to the lower 0.55kW tier. For a buyer who standardizes on small pumps, that lower power option can be commercially important because it may reduce the need to carry a separate model for small motor ratings.

At the upper end, the two models are aligned. Neither record shows a maximum power above 1.5kW. Therefore, if a pump motor exceeds 1.5kW, the published data for these two models should not be treated as sufficient evidence that either model can control it directly.

3. Connection thread options

The EPC-1.1 lists a wider set of connection thread options: G1, G1 1/4, G1 1/2, and NPT1. The EPC-3 record lists only G1. This is one of the most practical differences between the two products.

Thread standards matter because pressure control switches are mounted onto a pump or pipe port. G threads and NPT threads are not the same standard. A buyer who knows that the pump port is G1 may find the EPC-3 sufficient. A buyer who needs a smaller G1 1/2 connection, a larger G1 1/4 port, or an NPT1 option for a North American plumbing system is more likely to find a match in the EPC-1.1 model. If the correct port option is not available on the selected model, an external adapter or fitting may be required, which adds cost and assembly time.

Where the two models overlap

For a fair comparison, the shared specifications also need to be acknowledged. Both models are available with rated voltage options of 220-240V or 110-120V, so they can be considered for markets that use either voltage band. Both run at 50/60 Hz. Both support the same starting pressure options of 1.2bar, 1.5bar, and 2.2bar. Both have an IP65 protection rating and a maximum working temperature of 55 °C.

The IP65 rating means the enclosure is designed to resist dust ingress and low-pressure water jets, which is a relevant specification in pump areas where moisture is present. It should not be confused with an IP68 rating, which would indicate suitability for continuous immersion. The 55 °C maximum working temperature is also a boundary condition. A pump controller mounted close to a high-temperature water source, or inside an enclosure that regularly exceeds 55 °C, would need a model with a higher temperature rating.

Applications and typical procurement context

From a buyer perspective, application fit is the first filter. The EPC-1.1 is positioned for domestic water-system use. Typical procurement contexts include residential water supply installations, household pump sets, and similar small water systems where the control is expected to start and stop the pump automatically according to system pressure. The EPC-3 is positioned for use in agriculture irrigation, water treatment, and construction, which makes it a possible reference for pump systems in those project-based environments.

Both models are described in the manufacturer's application context as automatic pump start-stop controls. In this type of control, the device monitors pressure in the water system and starts the pump at the low-pressure setpoint, then stops the pump at the high-pressure setpoint. This functional description is helpful, but it should not replace the model-level verification that procurement teams still need to do.

Comparison context: traditional pressure switches and automatic pump controls

The broader pressure switch market still contains a large installed base of electromechanical products. Market Research Future estimates that electromechanical pressure switches accounted for about 62 percent of the global market share in 2024, while solid-state electronic types accounted for about 38 percent. That distribution is a useful background fact because it explains why many buyers still face a wider technology comparison before they get to the EPC-1.1 versus EPC-3 decision.

Traditional electromechanical pressure switches and automatic pump pressure controllers are not always interchangeable. A model-level comparison should not stop at voltage and pressure settings. Buyers also need to confirm whether the existing system uses a pressure tank, what the cut-in and cut-out requirements are, and whether the new controller is intended to replace an old mechanical switch or to be installed as part of a new control package.

In this comparison, the technology context matters for another reason. The EPC-1.1 and EPC-3 are two specific configurations inside the same family. The real procurement decision is not simply whether to buy an electronic pump controller or a mechanical pump controller. It is whether the correct model has been selected for the pump power, the connection thread, the operating environment, and the target application.

Market data for independent reference

Two externally verifiable market data points provide useful background. Fortune Business Insights values the global pressure switch market at USD 3.2 billion in 2025 and projects growth from USD 3.38 billion in 2026 to USD 5.13 billion by 2034. This market figure covers pressure switches broadly, not only water pump pressure controllers, so it should be read as industry context rather than as a model-specific forecast.

For procurement teams, the more decision-relevant observation is that the market is big enough to contain multiple types of control technology, multiple certification regimes, and many similar-looking models. This is why product-level documentation, model numbers, and published specifications are becoming more important than brand-level impressions.

Limitations and trade-offs

An independent comparison should also state what the EPC-1.1 and EPC-3 are not designed to do based on the published records.

First, neither model record lists a maximum power above 1.5kW. Applying either model to a pump motor that exceeds the listed maximum rating is not supported by the available specifications.

Second, the maximum working temperature is 55 °C. These are not high-temperature controller models. If the process fluid temperature or the controller enclosure temperature regularly rises above that level, a different product with a higher maximum working temperature would be needed.

Third, the EPC-3 offers only a G1 connection thread in the current specification record. The EPC-1.1 offers more thread options. A project that requires NPT1 or a G1 1/2 connection may therefore be a better fit for the EPC-1.1, assuming the application is domestic or compatible with the EPC-1.1's listed positioning.

Fourth, IP65 does not mean the product is submersible. It indicates a high level of protection against dust and water jets, but installation practices still matter. Cables and wire connections should be sealed properly, and the controller should be mounted in a position consistent with its rated ingress protection.

Selection checklist for EPC-1.1 versus EPC-3

The following checklist is written from a buyer's point of view and is based on the documented differences between the two models.

1. Check the application. If the end use is a domestic water system, the EPC-1.1 is the model whose record matches that segment. If the order is for agriculture irrigation, water treatment, or construction, the EPC-3 is the model whose record matches those industries.
2. Compare the motor power. Confirm the pump motor power against the maximum power options. The EPC-3 includes 0.55kW in addition to the 0.75kW, 1.1kW, and 1.5kW options shown for both models.
3. Verify the starting pressure. Both models offer 1.2bar, 1.5bar, and 2.2bar settings. The starting pressure should be matched to the system pressure and the pump lift.
4. Confirm the connection thread. The EPC-1.1 offers G1, G1 1/4, G1 1/2, and NPT1. The EPC-3 is listed with G1 only. Check the pump port or pipe connection before selecting the model.
5. Review the operating environment. Both models are rated IP65 with a 55 °C maximum working temperature. If the installation site is hotter or if submersion is possible, these two models may not be appropriate.
6. Check voltage and frequency. Both models list rated voltage options of 220-240V or 110-120V and a frequency of 50/60 Hz. Still, this should be confirmed against the local market specification for the specific order.

One calculation from the installation guidance is especially useful when selecting the starting pressure. If the starting pressure is 1.2bar, the maximum water use height is approximately 12 meters, and the pump lift should be at least 20 meters. The general rule is that the pump head should be at least 0.8bar higher than the start pressure of the controller.

Installation notes for automatic pump pressure controls

Installation practice is an important part of the buying decision because it affects the cost of commissioning. The manufacturer's installation guidance for this type of pump pressure controller includes several basic steps: first, check that the pump operates correctly and that the pump nameplate parameters match the controller; second, install the controller in the direction shown by the arrow on the housing; third, connect the controller power cord to a separate plug wire and wrap the connection with waterproof insulating tape; fourth, open the main outlet valve and all water faucets before connecting the power supply.

These instructions are standard for a controller that is mounted into a water system. For procurement teams, the practical point is that installation access, cable length, and mounting direction should be considered at the ordering stage, not only during installation.

Compliance context

For automatic pressure sensing controls used in household appliances and similar equipment, IEC 60730-2-6:2025 is the current international standard. Monro states that the company operates an ISO 9001:2015 quality management system, and that its product range holds TUV and CE certifications, with selected models approved under the CUL standard for the U.S. and Canada.

These certification statements are company-level. A buyer should still verify certification status against the specific EPC-1.1 or EPC-3 model being ordered, because certifications can be model-specific or market-specific. The same discipline applies to UL, CE, CUL, and other marks: the product documentation, not only the general company profile, is the best evidence.

Future outlook for buyers

The pump pressure control market is likely to continue expanding alongside the broader pressure switch market. Fortune Business Insights projects growth from USD 3.38 billion in 2026 to USD 5.13 billion by 2034. The continuing presence of electromechanical types at around 62 percent of the global market also suggests that traditional and automatic controls will coexist for a long time.

For buyers, this means the real competitive advantage will come less from choosing a technology type and more from building a disciplined comparison process that checks model number, application label, power range, connection thread, environmental rating, and certification status. Comparisons such as EPC-1.1 versus EPC-3 are part of that process, and they matter because small differences in connection options can determine whether a component fits a project without modification.

Frequently asked questions

For buyers comparing other models in the same portfolio, the full Monro product catalogue is available for reference: Monro 2025 catalogue (PDF).