Scheme of connecting an electric boiler to a network of 220 and 380 volts

The main issue that will be considered in this article is a typical scheme for connecting an electric heating boiler to a 220 and 380 Volt network. That is why the main bias will be directed only to the rules and sequence of connecting wires. As for the installation scheme of radiators, piping and other elements of the central heating system, we will provide it only in general form.

Installation options

Connecting lead-in wires

So, to begin with, we will figure out the options for connecting an electric boiler in a private house and apartment with our own hands:

  • If the capacity of the water heater does not exceed 3.5 kW, then it is usually powered from the outlet. In this case, the use of a single-phase 220V network is allowed.
  • In the event that the power varies between 3.5-7 kW, it is necessary to carry out electrical installation with your own hands directly from the junction box. This is due to the fact that the outlet may not withstand high current loads. As in the previous case, a 220-volt network is allowed for use.
  • Well, the last option that can be found is an electric boiler with a capacity of over 7 kW. In this case, it is necessary not only to lead a separate cable from the distribution box, but also to use a more powerful 3-phase 380V network.

Wiring in a single-phase network

As we have already said, you can connect a water heater to a single-phase network through a plug or a separately powered cable. There is no point in stopping at the first option, because anyone can insert the plug into the outlet.

As for the second option, first you need to implement calculation of the cable cross section for current (if the required core diameter is not indicated in the product passport), then bring the conductor to the place boiler installation. Then everything is simple - we connect the phase, zero and ground to the corresponding terminals in the unit (they are marked on the marking). To your attention, a schematic diagram of connecting an electric boiler with a temperature regulator to the heating system:220V network

Three-phase wiring

The scheme for connecting an electric boiler to a three-phase network is more complex, but still even a beginner can do it.

The three phases must be connected as follows:

Three phases

Pay attention to the following nuances:

  1. Each water heater comes with a technical data sheet, which must indicate the manufacturer’s recommended boiler piping scheme. Be guided only by this document in your case, as By no means always examples provided on the Internet may be suitable for your heating system.
  2. Be sure to protect the boiler circuit breaker and RCD. These devices will prevent overload of the unit, short circuit and leakage of current in the mains.
  3. Must be present grounding wiring.

To your attention a visual project of electric heating in a two-story cottage using a boiler:Scheme of connecting an electric boiler to pipes

In addition, we recommend watching a video that clearly shows the connection of an electric boiler to 380 V:

Connection of a three-phase electric boiler

Related materials:

Connection of a three-phase electric boiler

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