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To size a booster pump for a building, calculate your total flow demand (in L/min), determine the required pressure head (in meters), factor in building height and pipe friction losses, then match those numbers to a pump model with sufficient output power and max head rating.
Low water pressure is one of the most frustrating problems a building can have. Showers trickle. Faucets barely run. Upper floors get almost nothing. The fix is usually a pressure boosting pump—but buying the wrong size makes the problem worse, not better.
Getting the sizing right matters more than most people realize. An undersized electric pump will run at maximum capacity constantly, wear out faster, and still fail to deliver adequate pressure. An oversized one wastes energy and can cause pressure spikes that damage pipes. This guide walks you through exactly how to match a booster pump to your building's real-world needs.
A booster pump is an electric pump designed to increase water pressure in a system where the incoming supply isn't sufficient. Modern all-in-one units—like those in the Mepcato MD and MJD series—integrate the pump body, motor, pressure tank, and electronic controller into a single compact package.
The built-in electronic controller monitors flow and pressure continuously. When water is drawn from a tap or shower, the pump starts automatically. When demand stops, it shuts off. A stainless steel pressure tank helps buffer small fluctuations, reducing unnecessary cycling and extending the pump's lifespan.
These pressure boosting pumps work in three common scenarios:
Boosting from mains — increasing city supply pressure before it enters your building
Boosting from tanks — pumping from rooftop or ground-level storage tanks
Boosting from wells — drawing water from a depth of up to 6 meters
Sizing comes down to two core values: flow rate and pressure head. Get both right, and the pump will perform reliably for years.
Flow rate is measured in liters per minute (L/min) or cubic meters per hour (m³/h). Add up the peak simultaneous demand from all fixtures likely to be used at the same time.
General benchmarks per fixture type:
Shower: 8–12 L/min
Kitchen tap: 6–9 L/min
Bathroom basin: 4–6 L/min
Washing machine: 8–12 L/min
For a small residential unit with two showers, a kitchen tap, and a basin running simultaneously, peak demand could reach 30–40 L/min. A commercial property or multi-story apartment block will require significantly more.
Pressure head (measured in meters) accounts for:
Static head — the vertical height the pump must push water (roughly 10 meters of head per floor)
Friction losses — resistance caused by pipe length, bends, and fittings (typically add 10–20% to your static head)
Residual pressure — the minimum pressure needed at the outlet (usually 10–15 m)
A three-story building, for example, might need 30 m of static head plus 8 m of friction losses plus 12 m of residual pressure—totaling around 50 m of required head.
Mepcato manufactures two main booster pump series suited to residential and commercial buildings: the MD series (cold water, up to 40°C) and the MJD series (hot and cold water, up to 90°C). Both are CE-certified all-in-one electric pump units with automatic operation and built-in dry-run protection.
The table below covers the full model lineup with key sizing data:
Model | Series | Max Head (m) | Max Flow (L/min) | Output Power (W) | Water Temp | Best For |
|---|---|---|---|---|---|---|
MD300 | MD (Cold) | 26 | 65 | 200 | 4–40°C | Small apartments, single-story homes |
MD500 | MD (Cold) | 31 | 84 | 500 | 4–40°C | Mid-size buildings, commercial light use |
MD900 | MD (Cold) | 35 | 100 | 800 | 4–40°C | Multi-story residential, hotels |
MD1100 | MD (Cold) | 47 | 105 | 950 | 4–40°C | High-rise buildings, high-demand commercial |
MJD200 | MJD (Hot/Cold) | 25 | 60 | 200 | 4–90°C | Solar water heaters, small hot water systems |
MJD400 | MJD (Hot/Cold) | 27 | 74 | 400 | 4–90°C | Residential hot water boosting |
MJD800 | MJD (Hot/Cold) | 31 | 84 | 750 | 4–90°C | Mid-size buildings with hot water demand |
MJD1000 | MJD (Hot/Cold) | 35 | 100 | 900 | 4–90°C | Large buildings, commercial hot water systems |
All models operate on 220–240V / 50Hz power supply and support a max suction lift of 6 meters. Inlet/outlet size is 1 inch across the entire range.
Once you have your flow rate and head requirements, cross-reference them against the table above. The selected pump must exceed—not merely meet—both values, since real-world conditions always include some variation.
Choose the MD series if:
Your application is cold water only (below 40°C)
You need a reliable, compact electric pump for a residential or light commercial setting
The MD1100 suits high-rise buildings needing up to 47 m of head and 105 L/min of flow
Choose the MJD series if:
Your system includes hot water (solar heaters, hot water circulation, mixed systems)
Liquid temperatures may reach up to 90°C
The MJD series uses heat-resistant multistage plastic impellers designed specifically for high-temperature operation
For buildings with multiple zones or very high demand, consult a mechanical engineer or contact the booster pump manufacturer directly for a custom recommendation.
A well-specified pressure boosting pump should include the following protections:
Dry-run protection — shuts the pump off if there's no water supply, preventing motor burnout
Thermal overload protection — a built-in thermal protector guards against damage from excessive operating temperatures
Anti-cycling feature — prevents the pump from rapid on/off switching caused by dripping taps or minor system leaks
Non-return valve — prevents backflow within the system
Mepcato's MD and MJD series include all four of these features as standard, alongside PCB-based electronic control with an indicator light for easy status monitoring.
Sizing a booster pump correctly is straightforward when you work through the numbers systematically: calculate peak flow demand, determine total head requirements, account for building height and pipe friction, then select a pump model that comfortably covers both.
For most residential buildings up to three stories, the MD500 or MJD400 will cover the job. Taller buildings and higher-demand commercial properties should look at the MD1100 or MJD1000 for sufficient headroom.
Mepcato's full range of CE-certified booster pumps—from 200W compact units to 950W high-head models—covers the spectrum of building sizes and water types. Contact Mepcato directly to discuss your specific requirements or request a product inquiry at mepcato.com.
A 3-story building typically requires a pump with at least 35–50 m of head and 80–100+ L/min of flow capacity, depending on the number of fixtures. The Mepcato MD900 or MD1100 would suit most 3-story residential or light commercial buildings.
The MD series handles cold water only (4–40°C), while the MJD series handles both cold and hot water (4–90°C). Choose the MJD series for solar water heater systems or any application involving heated water.
Yes. Mepcato's MD and MJD series are designed to boost water from rooftop tanks, ground tanks, rainwater tanks, and city mains supply.
If the pump runs continuously without reaching the required pressure, it is undersized. If pressure is excessively high or pipes rattle, the pump may be oversized. Always size based on calculated peak demand plus a safety margin of 10–15%.
All Mepcato MD and MJD series booster pumps operate on a standard 220–240V / 50Hz supply, making them compatible with residential and commercial electrical systems across most markets.
