Check the new shower’s rating against its supply
An electric shower heats water using its electrical supply. A model with a different rating can place different demands on that installation. The existing cable, protection and connection arrangement need assessment rather than assumptions based on the old shower working.
Do not choose a cable size or a replacement protective device from a generic online chart. Route, installation conditions and the complete circuit affect the design. Send the old and proposed model information and let the electrician assess the requirement.
Physical fit and water connections also matter
Physical fit and water connections also matter
Cable entry, water entry, fixing positions and the visible footprint can differ between products. A replacement described as universal may still have particular installation conditions. Check the manufacturer information and the bathroom layout.
Explain whether the room is being retiled or you want existing finishes retained. A straightforward-looking product change can leave old fixing marks or need a different route. Agree who handles water connections and associated work alongside the electrics.
Check protection, isolation and existing faults
Check protection, isolation and existing faults
Bathroom equipment needs an appropriate installation for its position and environment. The electrician must consider the existing circuit and protection, not only connect a new unit to whatever is already present.
Tell us about the existing control arrangement and any current faults. An overheating smell, damaged control or repeated trip needs a fault discussion. Do not keep running a suspect shower or remove its cover to read internal details.
Include plumbing, testing and finishes in the quote
Include plumbing, testing and finishes in the quote
The scope should distinguish supplying the shower, electrical work, plumbing responsibilities, testing, documentation and any required notification. If additional work is needed, ask why and how it affects the bathroom programme.
Share the planned fitting date before booking delivery or another trade. Checking the installation first reduces the risk of discovering that the selected product cannot be installed within the assumed scope.
What to share with your enquiry
- Existing shower model
- Proposed replacement model and rating
- Product installation information
- Bathroom layout and finish constraints
- Any current faults and trade arrangements
Questions answered
Can I just increase the breaker size?
No. Protection must suit the complete circuit and installation. Changing a device is not a shortcut to establishing that a higher load is suitable.
Ask Max about thisWill replacing my electric shower disturb the tiles?
It can if the new unit has a different footprint, fixing positions or water and cable entries. Compare the exact models and agree whether existing marks will be covered and who handles any tiling or other making good.
Ask Max about thisWho handles the plumbing when an electric shower is replaced?
Agree the water connections and electrical responsibilities before booking. The quotation should state who supplies and fits the shower, completes each connection, tests the work and handles any associated repairs to finishes.
Ask Max about thisDoes a lower-kW replacement shower avoid the need for electrical checks?
No. A lower rating does not confirm the condition, protection or suitability of the existing installation. Supply the old and proposed model details and describe any current problems. The electrician should assess the complete replacement rather than relying on the two power ratings alone.
Ask Max about thisWhy does my replacement electric shower trip the electrics?
Stop using the shower and have the installation and appliance assessed; a trip does not identify which part is responsible. Share the model, when the replacement was fitted and any installation records. Do not keep resetting the protective device or try a larger breaker.
Ask Max about thisSources and further reading
Read the original guidance relevant to this question. Building Regulations and rental-law references here relate to England.