Plumbing a multi head shower system is no longer the exclusive domain of high-end commercial bathrooms. Thanks to advances in affordable valve technology, it is now a common renovation project for homeowners seeking a spa-like upgrade. However, the difference between a satisfying, powerful downpour and a disappointing, trickle lies in meticulous planning and execution. This guide walks you through the entire process, from initial measurements to the final leak test.
The complexity of a multi head setup is defined by its configuration. Are you aiming for two fixed overhead showers, or perhaps a fixed unit paired with a hand shower? The specific layout dictates the type of valve body you require. Selecting the correct hardware is the first critical decision, as it dictates the spatial and hydraulic requirements of your entire system.
Understanding the System Components
Thermostatic vs. Manual Diverter Valves
The heart of your multi head installation is the mixing valve. Thermostatic valves (TMV) are the premium choice, as they automatically regulate temperature, preventing sudden spikes of hot water if a tap is flushed elsewhere. While more expensive, they offer significant safety benefits, especially in households with children. Manual diverter valves, on the other hand, require the user to physically switch water between outlets, but they are a cost-effective solution for budget-conscious renovations.
Beyond the valve, you will need to consider the supply lines. Unlike a standard single shower, a multi head system often requires larger diameter pipes—usually 15mm or 22mm—to ensure adequate pressure is distributed to multiple outlets simultaneously. Insufficient pipe diameter is the primary cause of low flow in finished systems, so do not skimp on the main feed.
Planning the Layout and Water Supply
Mapping the Rough-In
Before you turn off a single tap, grab graph paper or digital design software to sketch your bathroom. Measure the exact positions of the shower curb, the drain, and the surrounding fixtures. You need to determine the ideal height for the shower head mounts and the hand shower holder. Typically, the main shower head is placed at 2.1 meters, while the hand shower rail is between 0.9 and 1.2 meters for accessibility.
Next, locate the nearest hot and cold water supply points. If these are centrally located, you can run concealed pipes to a hidden chase or the adjacent utility space. If the plumbing is situated far from the shower area, you may need to install a bulky access panel within the wall. This panel allows you to service the valves without demolishing the finished surface.
Installation Process
Step-by-Step Connection
With the planning complete, it is time to install. The process generally follows this sequence:
- Isolate the mains: Turn off the main water supply and open a low-level tap to drain the pipes.
- Feed the pipes: Run the necessary supply pipes to the shower location, ensuring they are supported correctly at regular intervals.
- Install the valve body: Secure the valve cartridge and body into the wall or chase, ensuring the inlets are clearly marked for hot and cold.
- Connect the outlets: Attach the flexible hoses or rigid pipes to the outlets for the overhead shower, body jets, and hand shower.
Pressure Considerations
Multi head showers are notorious for suffering from low pressure if the system is not balanced. If your home has a gravity-fed system with a cold water tank in the loft, you might need to install a pump to achieve the powerful spray most people expect. Conversely, properties with high mains pressure must ensure the valve is rated to handle the force, or you risk damaging the internal components.
Testing and Finishing Touches
The Final Check
With the connections made, turn the water back on slowly. Observe the joints meticulously for any signs of weeping or dripping. Once the supply is confirmed to be leak-free, test the function of the diverter mechanism. Switch between the outlets and adjust the temperature to ensure the thermostatic valve is maintaining a stable, safe setting.
Finally, finish the tile work and install the trim plates. Ensure that the grout and sealant are applied neatly to maintain the waterproof integrity of the shower pan. A well-plumbed multi head shower should deliver a powerful, balanced experience immediately, transforming your daily routine into a luxurious retreat.
