Grohe Frequently Asked Question
Tell me about High Pressure products
High Pressure products are designed to operate with pressurised systems, which include mains supply combination boilers, unvented hot water systems or by a pumping a gravity system. A minimum operating pressure of 1 bar is recommended.
Tell me about Low Pressure products
Products marked with HP/LP are designed for both gravity systems and pressurised systems. Minimum operating pressure is 0.1 bar is recommended which is a clear 1 metre vertical distance from the base of the cold-water tank to the water outlet.
What is a combination boiler?
This is a mains fed pressurised system that instantaneously heats the mains cold water. This requires no cold or hot water storage tanks.
Tell me about Gravity fed systems
Historically, the most common installation in the UK and is identified by the use of a cold storage tank normally in the loft space. Some taps may have gravity fed hot and mains cold, which is common in the kitchen mixer.
What is a Pumped system?
This is a gravity system with the addition of a booster pump to increase flow to particular taps, commonly used in the shower. The larger the pump the greater the flow rate.
Tell me about Pressurised/ unvented systems
Less common installation, where the hot water is stored under the mains pressure. This requires no cold-water storage in the loft and its performance is dependent on the mains supply pressure. For optimum performance all mixers should be supplied with balanced pressures.
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