Is 2.5 mm2 Wire Suitable for Bathroom Heaters?

The power of the bathroom heater is relatively large. When arranging the wiring, is it appropriate to choose a 2.5 square millimeter wire?

Can a 2.5 square millimeter wire be used for the bathroom heater?

The power of a bathroom heater can reach between 2000 to 3000 watts. Considering a 2.5 square millimeter wire, its current carrying capacity is about 22 amps, which can support a power of over 2000 watts. Therefore, using a 2.5 square millimeter wire is barely acceptable. However, it is advisable to upgrade to a 4 square millimeter wire because we must consider potential wear and tear on the wire over time. Additionally, modern bathroom heater products are increasingly equipped with more features, which generally results in higher power consumption. For safety reasons, selecting a 4 square millimeter wire is more suitable.

Can a 2.5 square millimeter wire be used for an electric water heater?

1. A 2.5 square millimeter copper wire has a current carrying capacity of 22 amps, which can indeed match the power requirements of an electric water heater, even covering those of a 3 kilowatt unit. While it can handle the load, it is not recommended for long-term use. Prolonged usage may lead to wire overload, causing aging and various electrical faults over time.

2. For safety reasons, it is advisable to select a 4 square millimeter wire. It is better to plan ahead and choose a thicker wire to avoid future issues and potential rewiring.

3. The installation environment also matters; some people choose to lay the wires hidden, while others prefer external installation. If the wires are buried, the safe current is lower, thus only the maximum limit can be applied. If the wires are exposed, the current carrying capacity will be reduced even further, so comprehensive consideration is necessary.

How to choose wiring for the bathroom?

When arranging wiring in the bathroom, it is suggested to plan for an electrical load that is approximately 1.2 to 1.5 times the expected usage. This ensures there is sufficient capacity to maintain safe operation. For instance, if the total power of all appliances sums up to 5000 watts, the wire should be chosen based on 6000 or 7500 watts.

In summary：when laying out wiring in a bathroom, the choice of wire specifications should vary according to the power levels of different electrical appliances. For high-power devices, it is recommended to select wires that are slightly thicker to account for potential wear over time.