The wires needed to start the water heater and the hot air blower at the same time depend on many factors, such as the size of the room, the height of the ceiling, the wire materials used and so on. We can make a preliminary estimate according to the power of water heater and hot air blower.

Let's look at the 2200 watt water heater. This power is equivalent to about 9.6 amperes (A) of current flowing in a 220 volt (V) circuit. So if you use the 14 line (also known as 2.5 square millimeters), the longest line can be extended to a distance of 30 meters. In this case, it will be able to work normally without exceeding the safety limit. If larger wires are used, the distance can be extended.

Let's take a look at the 3000-watt hot air blower. This power is equivalent to the current flowing in a 220V circuit of about13.6a.. Similar to a water heater, you need to use wires of sufficient size and length to support it.

Therefore, in the 220V 16A circuit, the wires required for starting the 2200 W water heater and the 3000 W hot air blower must be at least 3*2.5 square millimeters to ensure safe and stable operation.

This is only a preliminary estimate. If you want to ensure full compliance with safety standards, you'd better consult a professional electrical engineer or technician for more detailed information.

You need to use wires of sufficient size and length to support the 2200-watt water heater and the 3000-watt hot air blower. When selecting wires, be sure to consider safety factors and follow relevant regulations and standards.