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Best 8.5kW Electric Showers for Reliable Hot Water

  • June 30, 2025
  • 7 minute read
credit: Mira
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Finding the right 8.5kW electric shower can make all the difference to your daily routine. It needs to be reliable, heat up quickly, and deliver steady pressure without running up your energy bills. A good one won’t just look smart in the bathroom, it’ll also be easy to use and hold up well over time. Here, we’ve picked out some of the best-performing models available right now, focusing on durability, ease of use, and overall value.

1

Exceptional

Mira Jump Multi-Fit 8.5kW Electric Shower

4.8 out of 5
  • Wattage: 8.5 kW
  • Installation: Wall mounted
  • Showerhead size: 90 mm
  • Hose length: 675 mm
  • Spray modes: 3 settings
  • Temperature control: Pressure stabilised

What We Like

  • Flexible setup works with most bathroom layouts
  • Quick to install when replacing older units
  • Eco mode helps reduce energy and water bills
  • Limescale build-up reduced for longer lifespan
  • Clear, simple controls make operation easy
  • Sleek chrome finish adds a modern touch
  • Rub-clean nozzles allow hassle-free maintenance
  • Separate dials offer better temperature precision
View on Amazon.co.uk

2

Exceptional

Triton T80 Easi-Fit 8.5kW Electric Shower

4.7 out of 5
  • Wattage: 8.5 kW
  • Showerhead settings: 5 patterns
  • Cable entry: Left or right
  • Water entry: Reversible 180°
  • Hose length: 1.25 m
  • Hose material: Chrome stainless steel
  • Controls: Push button Start/Stop
  • Safety rating: BEAB approved

What We Like

  • Start/Stop button remembers your last setting
  • Designed to simplify tricky installations
  • Durable hose resists twisting and kinks
  • Reversible inlet fits most plumbing setups
  • Five spray modes for a tailored shower feel
  • Certified safe to UK and EU standards
  • Covered by a 2-year parts and labour warranty
View on Amazon.co.uk

3

Exceptional

Triton Cara 8.5kW Electric Shower

4.6 out of 5
  • Wattage: 8.5 kW
  • Water system: Cold mains
  • Minimum pressure: 1 Bar @ 8 l/min
  • Max static pressure: 10 Bar
  • Hose length: 1 m
  • Controls: Separate temperature and power

What We Like

  • Simple to operate with clear manual dials
  • Great fit for upgrading older shower models
  • Entry points on both sides for easy fitting
  • Reliable daily use without complex features
  • Budget-friendly without cutting key functions
  • Glossy ivory finish blends into neutral bathrooms
  • Good performance even at lower pressures
  • Backed by a 2-year manufacturer’s warranty
View on Amazon.co.uk

What Makes an 8.5kW Shower a Good Choice?

An 8.5kW shower strikes a decent balance between power and efficiency. It heats water quickly without putting too much strain on your fuse box, making it suitable for most UK homes. It’s also a solid option if your water pressure isn’t the best, as many models come with pressure-stabilised controls.

Is 8.5kW Enough for a Warm Shower Year-Round?

Yes, for most households. While higher wattages like 10.5kW might heat water slightly quicker, 8.5kW still does a reliable job, even during the colder months. The key is choosing a unit with good internal components and a well-designed heating system.

Can I replace a 9.5kW shower with an 8.5kW one?

Yes, you can, but it’s best to check your wiring and fuse rating first. Going down in wattage is usually safer than going up, but you still need to make sure the cable and breaker are suitable. An electrician can confirm this in a quick check.

Installation Tips for 8.5kW Electric Showers

  • Check your wiring: You’ll typically need a 6mm² or 10mm² cable depending on distance and setup.

  • Circuit breaker size matters: A 40A breaker is usually fine for 8.5kW, but always check with an electrician.

  • Water pressure: Make sure your mains pressure meets the unit’s minimum requirements, usually around 1 bar.

  • Cold water feed only: Electric showers don’t need a hot water connection, just a decent cold feed.

  • Hire a qualified installer: It’s not a DIY job. You need a Part P registered electrician for safety and compliance.

Do 8.5kW electric showers work well with combi boilers?

Electric showers are completely independent of your boiler. They heat water instantly from the mains cold feed, which makes them a smart choice even if your boiler plays up. They’re also great as a backup system if your central heating goes down.

 

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