Signs you need water heater installation
- The heater gives lukewarm water or cuts out mid-shower
- You feel a slight tingle from the shower head or tap
- The RCCB trips when the heater is switched on
- The heater has no 10mA RCCB of its own
- You are adding a heater to a second or third bathroom
- The heater is plugged into an ordinary 13A socket in the bathroom
How much does water heater installation cost in KL?
Our current prices for water heater installation across Kuala Lumpur and Selangor (updated October 2026). You get a fixed quote on site before any work starts.
| Job | Price (RM) |
|---|---|
| Water heater installation (existing point)per unit | RM150 – RM250 |
| Water heater with new point + 10mA RCCBper unit | RM350 – RM550 |
| 10mA RCCB added to existing heater pointper unit | RM250 – RM450 |
Prices include labour and standard materials (cable, trunking, standard switches and sockets) unless the item says otherwise. See the full price list.
What's included
- 1Check the existing point, cable size and earthing
- 2Mount the heater level, on a wall that can take its weight
- 3Connect to a dedicated circuit with a 10mA RCCB and double-pole switch
- 4Fit the shower set and check every joint for leaks
- 5Test the RCCB trip and the heater earth
- 612-month workmanship warranty
Do I need a 10mA RCCB for my water heater?
Yes. Malaysian rules require 10mA RCD protection for water heaters and other wet locations. Many heaters fitted before this became standard rely only on the house's 30mA or 100mA RCCB, which is not enough in a wet bathroom.
Many instant heaters have a small built-in ELCB. We still fit a 10mA RCCB in the DB box, so your safety does not depend on a part inside a hot, humid bathroom. Adding one to an existing point costs RM250 to RM450.
Instant or storage water heater: which should I choose?
Instant heaters, typically 3.3–3.6kW, heat water as it flows and suit a single shower. Storage heaters hold 20 to 50 litres or more and can feed a shower and basin together, or a rain shower that needs more flow.
Storage heaters need a solid wall, pressure-rated pipework and a safety valve. We handle the electrical side and mounting, and quote pipework after seeing the bathroom. For like-for-like swaps, a WhatsApp photo usually lets us quote.
Can I plug a water heater into a normal socket?
No. A water heater needs its own circuit from the DB box, a 20A double-pole switch outside the shower area and a 10mA RCCB. A 13A socket in a bathroom is unsafe and shares load with other appliances. We find this often in older condos and rented units.