Gardena Hydrofor Pump 3700/4 09023-20

Gardena Hydrofor Pump 3700/4 (09023-20)

Overview

The Gardena Hydrofor Pump 3700/4 is a fully integrated domestic water supply system designed for automatic distribution of non-potable water in households and gardens. It combines a self-priming electric pump with a pressure tank, allowing it to maintain consistent water pressure while minimizing motor switching cycles. This makes it highly efficient for long-term residential use.

Technical Specifications

The unit is powered by an approximately 800 W electric motor and delivers a maximum flow rate of up to 3700 liters per hour. It can achieve a maximum pressure of around 4.1 bar, making it suitable for multi-point water distribution systems. The self-priming capability allows suction from depths of up to 7 meters, enabling use with wells, cisterns, and rainwater tanks.

Pressure Tank System

A key feature is the integrated 19-liter pressure tank equipped with a durable EPDM membrane. This tank stores pressurized water and reduces pump start/stop frequency, which significantly extends motor lifespan and improves energy efficiency. It also ensures smoother water delivery without pressure fluctuations.

Materials & Construction

The pump housing is made from reinforced, corrosion-resistant synthetic materials designed for durability in humid or semi-outdoor environments. High-quality mechanical seals and brass fittings enhance reliability and reduce maintenance needs over time.

Applications

This hydrofor pump is suitable for rainwater harvesting systems, garden irrigation networks, toilet flushing, washing machines, and general household water supply where potable water is not required.

Installation & Maintenance

Installation is typically performed in a dry, frost-protected area such as a basement or utility room. Regular maintenance includes checking pre-pressure in the tank, inspecting seals, and ensuring inlet filters remain clean. Proper winterization is recommended in cold climates to prevent damage.