Shower Buying Guide: Electric vs Mixer, Pressure, Trays & Enclosures

Choosing a shower involves more than picking a handset and finish. The shower type needs to suit the property's hot-water system, available water pressure, electrical supply, bathroom layout and the way the shower will be used. A powerful-looking shower can perform poorly if it is matched to the wrong system, while an unnecessarily complex setup can add cost and maintenance.

This UK shower buying guide explains electric showers, mixer showers, thermostatic controls, power showers, shower enclosures, trays and the key checks to make before ordering. Browse our full showers range while you compare the options.

What type of shower should you choose?

The main choices are electric showers, mixer showers and power showers. Each heats or supplies water differently, so the best option depends on your boiler, cylinder, mains pressure and pipework. If you are replacing an existing shower, staying with the same basic system type can simplify installation, but a bathroom renovation is a good opportunity to review whether another setup would suit the property better.

Electric showers

Electric showers heat cold mains water inside the shower unit. Because they do not rely on stored hot water, they can continue to provide a shower even if the boiler is not heating domestic water.

Electric showers are rated in kilowatts, with common domestic outputs such as 8.5kW, 9.0kW and 10.5kW. A higher kW rating can improve potential flow at a given shower temperature, but the electrical circuit, cable size and protective devices must be suitable for the appliance.

Products such as the Triton T80Z Fast-Fit electric shower are designed with replacement installations in mind, while the Triton T80Z 10.5kW thermostatic electric shower adds thermostatic control in a higher-output model.

8.5kW vs 9.5kW vs 10.5kW electric showers

The kW rating describes the electrical heating power. In general, a higher-rated electric shower can heat a greater flow of water to the same temperature, which can feel stronger in colder months when the incoming mains water is cooler.

Do not upgrade from 8.5kW to 10.5kW without checking the electrical installation. The existing cable and circuit may not be sized for the increased load. An electrician should confirm whether the circuit is suitable before the new shower is connected.

Mixer showers

Mixer showers blend hot and cold water supplied by the property's plumbing system. They can provide a strong flow where the boiler, cylinder and water pressure are suitable and are available as exposed bar mixers, concealed valves and multi-outlet systems.

The Mira Evoco dual mixer shower is an example of a mixer shower in our range. We also stock bar mixer configurations such as the Hudson Reed thermostatic bar mixer shower set.

Thermostatic mixer showers

A thermostatic shower valve is designed to maintain a more stable outlet temperature when hot or cold supply conditions change. This makes thermostatic mixer showers popular in family bathrooms and busy homes where taps or appliances may be used elsewhere at the same time.

Thermostatic control does not remove the need for suitable pressure and flow. Check the minimum and maximum operating pressures stated for the shower valve and make sure the hot and cold supplies are balanced appropriately for the installation.

Power showers

A power shower mixes hot and cold stored water and uses an integrated pump to increase flow. It can be useful in suitable low-pressure gravity-fed systems, but it is not the same thing as an electric shower.

The Triton AS2000SR thermostatic power shower is an example of this type. Power showers normally require stored hot water, so they are not generally used with a combi boiler in the same way as a mains-pressure mixer shower.

Which shower works with a combi boiler?

A combi boiler can work well with a mixer shower because it supplies hot water directly from the mains. The available performance depends on the boiler's hot-water output and the incoming mains flow and pressure.

Electric showers are independent of the combi boiler for water heating because they use a cold mains feed. Power showers, by contrast, are designed around stored hot water and therefore require a different system arrangement.

Which shower works with an unvented cylinder?

Unvented cylinders can provide strong mains-pressure hot water when the incoming supply is adequate. This makes them well suited to many thermostatic mixer and multi-outlet shower systems.

Where a shower has an overhead head, handset and body jets, total flow demand can be much higher than with a single outlet. The cylinder, boiler or heat source and incoming water supply should be sized to support the intended simultaneous use.

Exposed vs concealed shower valves

Exposed shower valves sit on the finished wall, making them easier to access for installation and future maintenance. Bar mixer showers are a familiar example and can be cost-effective to fit when pipe centres are suitable.

Concealed shower valves hide most of the valve body inside the wall, leaving only controls and outlets visible. This creates a cleaner appearance but requires more planning. Wall depth, access panels, waterproofing and future servicing should all be considered before the wall is closed.

Single outlet vs dual outlet showers

A single-outlet shower controls one shower head or handset. Dual-outlet systems can switch between or supply two outlets, often combining a fixed overhead head with a handheld shower.

More outlets increase both complexity and potential water demand. Check whether the valve allows one outlet at a time or simultaneous use, and ensure the hot-water system can supply the required flow.

Shower heads and riser kits

Large rainfall shower heads can create a luxurious feel but generally need more flow than a small handset. If water pressure is limited, an oversized head may provide a disappointing spray pattern.

Adjustable riser rails are useful where several people of different heights use the same shower. Fixed heads provide a cleaner look but should be positioned carefully before installation because height changes later can be difficult.

Shower enclosures

Shower enclosures include sliding doors, hinged doors, quadrants, offset quadrants and walk-in panels. The right choice depends on room layout and available opening space.

A sliding shower door such as the Merlyn Mbox sliding door can work well where there is not enough room for a hinged door to swing outward. Quadrant and offset-quadrant enclosures can make efficient use of a corner, while walk-in panels suit larger showering areas.

Shower trays

Shower trays are available in square, rectangular, quadrant and offset-quadrant shapes. Match the tray dimensions to the enclosure and check the waste position before finalising the pipework.

Low-profile trays create a clean appearance but can require enough floor depth for the waste and trap. Raised trays offer easier access to pipework in some installations. The floor must be stable and prepared according to the tray manufacturer's instructions.

What shower size is best?

For an enclosure, size is mainly controlled by available floor area and comfortable standing space. Compact bathrooms may use smaller square or quadrant enclosures, while 1200mm and larger rectangular layouts provide more movement and can support walk-in designs.

Measure finished wall-to-wall dimensions after allowing for tiles and wall finishes. Do not rely only on rough structural measurements because a few millimetres can matter when fitting a framed enclosure.

Water pressure and shower performance

Water pressure is often discussed, but flow rate is equally important. A property may show reasonable static pressure while still delivering limited flow through small pipework or a restricted mains supply.

Check the shower manufacturer's minimum operating pressure and required flow. If you are planning a large overhead shower or multiple outlets, have the supply tested before buying expensive fittings.

Bathroom waterproofing

The shower unit and enclosure are only part of a watertight installation. Wet areas need an appropriate waterproof background or tanking system, correctly sealed penetrations and properly detailed tray or bath junctions.

Silicone should not be treated as a substitute for correct waterproofing behind tiles. Follow the enclosure, tray and wall-system instructions for sealing locations because applying sealant in the wrong place can sometimes trap water.

Shower buying checklist

• Identify whether you need an electric, mixer or power shower.
• Check the boiler, cylinder and water-pressure arrangement.
• For electric showers, confirm the circuit is suitable for the kW rating.
• Choose thermostatic control where stable temperature is a priority.
• Decide between exposed and concealed installation.
• Measure the enclosure and tray after allowing for wall finishes.
• Check whether one or multiple shower outlets will be used.
• Plan waterproofing and future servicing access.
• Use qualified electrical and plumbing installers where required.

Frequently asked questions

Is an electric shower better than a mixer shower?

Neither is universally better. Electric showers heat cold mains water independently, while mixer showers can provide stronger flow where the hot-water system and pressure are suitable.

What kW electric shower should I buy?

Choose a rating that provides the performance you want while remaining compatible with the electrical circuit. A higher kW model may require upgraded wiring and protection.

Can I use a thermostatic mixer shower with a combi boiler?

Yes, many thermostatic mixer showers are compatible with combi boilers, provided the boiler and mains supply meet the required pressure and flow conditions.

What is the best shower enclosure for a small bathroom?

Sliding doors and quadrant enclosures are popular because they do not need a large outward door-swing area. The best option depends on the exact room and tray dimensions.

Shop showers online

Browse showers online including electric showers, thermostatic mixers, power showers, enclosures and shower accessories. Match the shower type to the property's water and heating system first, then choose the controls, finish and enclosure that suit the bathroom design.