What it costs to wire in a water heater or heat pump

Why a new appliance needs its own circuit

A water heater or heat pump is not something you plug into a spare socket on a shared circuit. It draws a steady, often heavy load for long periods, and sharing that circuit with lighting or other sockets risks nuisance tripping at best and overheating cable at worst. The standard approach is a dedicated circuit: its own cable run from the consumer unit, its own breaker sized for the appliance, and nothing else on that line.

This matters more in older housing stock. A 1930s wooden house in Kalamaja or Nõmme, or a Soviet-era panel flat, was wired for a much smaller load than a modern heat pump or a 3 kW immersion heater expects. Newer developments with underfloor heating and a modern consumer unit are usually closer to ready, but even there the specific circuit for the new appliance normally still needs to be added rather than borrowed from an existing one.

What shapes the price of the electrical connection

The core cost is labour, charged from 49 € per hour by a qualified electrician, plus materials such as cable, a breaker, and sometimes an isolator switch near the appliance. A straightforward run in an accessible space, chasing not required, can be a few hours' work. A run through finished walls, up through floors, or across a loft with poor access takes longer and costs more.

Distance from the consumer unit to the appliance is the other big variable. A water heater installed near the existing consumer unit is a short, cheap run. A heat pump's outdoor unit on the far side of the house, or in a different building on the plot, means a much longer cable and possibly outdoor-rated conduit, which adds both material and time.

For anything beyond a simple hour or two of work, it is worth asking for a fixed quote once you can describe the appliance, its location, and the route the cable will take. That figure, valid for 30 days, is what you actually pay, rather than an hourly estimate that depends on how the job goes.

When the consumer unit needs a look, or a replacement

Before any new circuit is added, the consumer unit itself needs checking: is there a free way in for another breaker, and can the existing main fuse or breaker actually supply the extra load alongside everything else in the home. In many older flats and houses the answer is no, and the consumer unit needs work before the appliance can be connected at all.

Sometimes this means fitting a larger breaker and one additional circuit into existing space, a relatively small job. In other cases the unit is full, outdated, or rated too low overall, and a full replacement is the more sensible route. A consumer unit replacement starts from 350 € per job, and this is worth budgeting for separately from the appliance-specific wiring rather than assuming the two are the same thing.

Three-phase power — when it is actually needed

Most electric water heaters run happily on a standard single-phase circuit. Heat pumps, especially larger air-to-water or ground-source units, more often need a three-phase connection, both to spread the load and because some compressors are built to run that way. Whether your specific unit needs it is stated in the manufacturer's technical documentation, and it is worth checking before you commit to a model.

If the property does not already have a three-phase supply, this is not just an internal wiring job. It usually means contacting the grid operator to check what the property's connection point allows, and possibly arranging a change to the supply itself, which sits outside what an electrician can resolve alone. This step, if needed, should be sorted out before ordering the heat pump, not after it arrives.

What is usually included, and what counts as extra

A standard electrical connection job covers running and connecting the dedicated circuit, fitting the breaker, and any isolator or connection point the appliance needs at its end. It does not usually cover making good plastered walls after chasing, painting, or moving furniture and flooring out of the way, and it is worth asking in advance which of these are your responsibility.

Materials bought by us carry a 10 % handling fee on top of the cost price, or you can supply cable and fittings yourself if you would rather buy them directly. Either way, ask for this to be itemised on the quote so there is no ambiguity about what is labour and what is materials.

• Usually included: cable run, dedicated breaker, connection at the appliance
• Usually extra: making good walls or floors after chasing, decorating
• Usually extra: consumer unit upgrade or replacement, if needed first
• Usually extra: any grid operator work for a three-phase supply
• Ask in advance: whether materials are supplied by us (plus 10 %) or by you

How to ask for a quote that gives you a tighter range

A rough phone estimate will always be a wide range, because so much depends on the property. To get a narrower figure, send photos of the existing consumer unit with the cover off, the make and model or technical sheet of the appliance you are buying, and the planned location of both the appliance and its outdoor unit if it has one.

It also helps to say whether the property currently has a single-phase or three-phase supply, and roughly how far the new appliance will sit from the consumer unit. With that information a fixed quote can usually be given without a site visit, though a call-out of 25 € within Tallinn applies if a visit turns out to be needed, and this is deducted from the bill if the work goes ahead.