Can You Use a Mixer Shower with a Gravity-Fed System?
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If your home has a gravity-fed water system, you may be wondering whether a mixer shower is a suitable option. The short answer is: yes, you can use a mixer shower with a gravity-fed system, but there are a few important things to consider to ensure you get good performance.
In this article, we’ll explain what a gravity-fed system is, how it affects shower pressure, and the best ways to make a mixer shower work well in this setup.
What Is a Gravity-Fed System?
A gravity-fed system is one of the most common water systems in older UK homes. It consists of:
- A cold water storage tank, usually in the loft
- A hot water cylinder, typically in an airing cupboard
- Water flow that relies on gravity, not mains pressure
This means that water pressure is generally lower, especially in upstairs bathrooms or if the cold water tank isn’t positioned much higher than the shower.
Can a Mixer Shower Work with Low Pressure?
Mixer showers mix hot and cold water to your desired temperature, and they rely on a balanced flow rate from both supplies. With a gravity-fed system, pressure is naturally lower, so yes, a mixer shower can work, but performance may vary depending on your setup.
If the pressure is too low, you may experience:
- Weak water flow
- Inconsistent temperature
- Poor showering experience overall
But don’t worry, there are solutions!
How to Make a Mixer Shower Work Well with a Gravity-Fed System
1. Choose a Low-Pressure Compatible Mixer Shower
Some mixer showers are specifically designed to operate at low pressures (typically as low as 0.1 bar). Look for these options in product descriptions and specifications.
2. Install a Shower Pump
If pressure is too weak, adding a shower pump is often the most effective solution. It boosts the flow from your hot and cold supplies, giving you a much more powerful shower experience.
- Single impeller pumps boost one supply (usually hot)
- Twin impeller pumps boost both hot and cold for a balanced flow
You’ll need to check if your system is pump-compatible, and pumps must be installed by a qualified professional.
3. Ensure Balanced Water Supplies
Gravity-fed systems sometimes deliver hot and cold water at different pressures. A balanced pressure setup (with or without a pump) ensures your mixer shower can maintain a steady temperature.
Other Factors to Consider
Distance from the Cold Water Tank
The greater the vertical distance between your shower and the cold water tank (known as "head height"), the better the natural pressure. A minimum of 1 metre is ideal for basic performance without a pump.
Pipework and Flow Restrictions
Narrow or outdated pipes can restrict flow. If your home has older plumbing, it may be worth consulting a plumber before installation.
Thermostatic vs Manual Mixer Showers
For gravity-fed systems, thermostatic mixer showers are generally a better choice as they maintain consistent temperatures, even if someone uses a tap elsewhere in the house.
Yes, you can absolutely use a mixer shower with a gravity-fed system, you just need the right equipment and setup. Whether that’s choosing a low-pressure compatible shower or adding a pump for a better flow, there are reliable ways to get a great showering experience from your current system.
At Gainsborough Showers, we offer a range of mixer showers and expert advice to help you choose the best option for your home.