Boiler Installation and Replacement in Warsaw

Has your water heater stopped working, or have you moved into a flat with no hot water? Connecting an electric boiler is more than just hanging a tank on the wall. It needs proper anchoring (an 80-litre boiler full of water weighs over 90 kg), a cold-water supply line, a hot-water outlet, a pressure relief valve, and a dedicated electrical circuit with an RCD. We work across all of Warsaw — from Mokotow to Bielany — and arrive with tools and a basic set of fittings.

How much does it cost and what affects the price

The cost of boiler work depends on the type of service: connecting an already mounted tank, a full installation from scratch, or replacing an old water heater with a new one. Price factors include tank capacity (30, 50, 80, or 100 litres — the heavier the unit, the harder the mounting), wall material (concrete, brick, or plasterboard on a frame), readiness of existing plumbing, and whether a dedicated electrical line needs to be run. Basic fixings are included in the service price, while consumables (fittings, flexible connectors, cable) are charged separately as needed. Current prices are in the table below.

How the installation goes

1. You send a photo of the installation spot and the boiler model — the technician assesses the scope and gives an approximate price.
2. We agree on a time — usually same-day or next-day visit.
3. On site, the technician checks the wall: concrete or brick means expansion anchors; plasterboard means special load-spreading fixings or mounting through the stud into the structural wall.
4. We mark the mounting points according to the boiler’s bracket. Drill, set the anchors, and hang the tank.
5. We connect the cold-water inlet (blue marking). We fit a pressure relief valve (mandatory — without it, the tank can burst from pressure). We connect the hot-water outlet.
6. We connect the electrics. The boiler must be on a dedicated circuit breaker and an RCD rated at 30 mA. We check the earthing — without it, the tank casing can give electric shocks.
7. We fill the tank, check every connection for leaks. We open the hot tap and wait for a steady, air-free flow. We switch on heating and verify thermostat operation.

Common mistakes when installing a boiler

• Hanging a heavy boiler on plasterboard without reinforcement — over time the tank pulls away from the wall, taking the cladding with it.
• Not fitting a pressure relief valve — during overheating the pressure inside the tank rises and it can deform or burst.
• Plugging the boiler into a shared socket via an extension lead — wiring overheats, fire risk.
• Forgetting the RCD — if there is a fault to the casing, water from the tap can give an electric shock.
• Not providing a drain from the relief valve — water drips onto the floor instead of into a drain or container.
• Mixing up the inlet and outlet — the boiler works incorrectly and hot water does not reach the taps.
• Not checking system pressure — if pressure exceeds 6 bar a reducer is needed, otherwise the valve will drip constantly.
• Placing the boiler in an enclosed niche without ventilation — casing overheats and service life is shortened.

What to prepare before the technician arrives

• Decide on the location: bathroom, kitchen, utility closet, niche — the technician needs to know in advance.
• Find out the wall material at the mounting point: concrete, solid brick, hollow brick, or plasterboard.
• If the wall is plasterboard — let the technician know so he brings reinforced fixings or locates a load-bearing stud.
• Check whether there is a cold-water supply near the installation spot.
• Make sure there is a hot-water outlet point (or piping to the taps).
• Check the consumer unit: is there a free 16A breaker and space for an RCD?
• If the boiler is new — do not fully unpack it, but check the contents (mounting bracket, pressure relief valve).
• If it is a replacement — shut off the water and disconnect the old boiler from the mains before the technician arrives.
• Have a basin and cloths ready — water remains in the old tank during removal.
• Provide entry details: intercom code, parking information.

A real case from Warsaw

A client in the Wola district bought an Atlantic Steatite 80-litre boiler for the bathroom. The old 50-litre unit could no longer cope — there was not enough hot water for two people. The bathroom wall was hollow brick, so standard expansion anchors would not hold — the technician used chemical anchors for a secure fix. We drained and removed the old boiler. The new tank was hung and connected to the existing water outlets via flexible connectors. The pressure relief valve was fitted with a transparent drain tube running to the waste pipe, so any dripping is visible. The electrics needed upgrading: the old boiler had been plugged into a regular socket with no RCD. The technician ran a dedicated line from the consumer unit with a 16A/30mA RCBO. After filling the tank we checked every joint — all dry. Within 40 minutes the water reached 60 degrees. The entire job took about three hours.

Frequently asked questions

Can I install a boiler myself?
Hanging it and connecting the water is technically possible if you have experience. But the electrical part (dedicated line, RCD, earthing) should be done by a professional. A boiler is an appliance that works with water and electricity simultaneously — mistakes here are life-threatening.

What size boiler should I choose?
30 litres — for a kitchen or one person. 50 litres — for one or two people (shower). 80 litres — for a family of two or three. 100 litres — if you use a bathtub or the family is larger. The technician can advise during the site visit.

Is an RCD mandatory for a boiler?
Yes. It is not a recommendation but a safety requirement. An RCD (or RCBO) cuts the power if current leaks to the casing. Without it there is a real risk of electric shock through the water.

What is a pressure relief valve and why is it needed?
It is a valve on the cold-water inlet that releases excess pressure during heating. Without it the tank can deform or rupture. The valve usually comes with the boiler — do not throw it away.

Can a boiler be mounted on plasterboard?
Yes, but with caveats. It must be fixed through the plasterboard into the structural wall, or a dedicated frame must be used. An 80-litre boiler full of water weighs close to 100 kg — standard toggle bolts will not hold.

How long does a boiler replacement take?
If the plumbing and electrics are ready and it is a straight swap — about two hours. If electrical or plumbing work is needed — up to four hours.

What is included in the price?
Labour, fixings (anchors, plugs), travel within Warsaw. Consumables (flexible connectors, fittings, cable, RCD) are charged separately as needed.

Do you take the old boiler away?
Removal is included in the replacement service. Carrying the old boiler out of the flat is an extra charge. Disposal needs to be arranged separately or discussed in advance.

Who does the work

Boiler installation and replacement is handled by technicians experienced with flats of all layouts — from older buildings in Praga to new developments in Wilanow. We arrive with tools, a hammer drill, and a basic set of fittings. If extra materials are needed, we discuss it beforehand. To book, call or message us — we reply within an hour.