Hot Water Cylinder Repair in Porto
Reparon24 repairs electric hot water cylinders in Porto and across Greater Porto, at any hour, every day of the year. Call or WhatsApp +351 928 286 711: a technician comes to your home, finds the fault and gives you a free quote before starting the repair.
In short
- Where
- Porto, Matosinhos, Vila Nova de Gaia, Maia, Gondomar, Valongo, Espinho, Vila do Conde and Póvoa de Varzim
- When
- 24 hours a day, including nights, weekends and public holidays
- How to book
- Phone or WhatsApp, ideally with a photo of the cylinder
- Quote
- Free, given on site after the diagnosis and before any work

What might be wrong with your cylinder
Back in the UK you might call it a hot water tank or an unvented cylinder. In Portugal it is a termoacumulador, or cilindro: an electric tank that heats the water and keeps it hot until you use it, and nobody thinks about it until the shower runs cold.
You do not need to know the name of the part. Tell us what is happening: no hot water at all, hot water that runs out fast, or water under the tank. Each symptom points to a different cause.
Cylinder not heating
The water runs cold at every tap and the cylinder seems to be on. Most of the time the heating element has burnt out or the thermostat has failed, and both parts are replaced without changing the tank. Before you call, check in the fuse box that the cylinder breaker is on. We also wrote a guide with the checks you can make yourself for a hot water cylinder not heating.
The breaker trips when the cylinder comes on
If the breaker trips every time the cylinder starts heating, there is a fault in the appliance or in the circuit that feeds it. Do not keep resetting it: that hides the problem and heats the installation. We test the cylinder on its own and then the circuit. If the fault is in the wiring, it becomes a job for an electrician in Porto, and one call covers both.
Hot water runs out fast
The shower starts hot and goes cold much sooner than it used to. When the cylinder heats but the water does not last, the usual cause is limescale settled at the bottom of the tank, taking up the space the water should fill. We clear the limescale and check the anode at the same time. Sometimes the cause is simpler: more people now live in the flat and the cylinder is no longer big enough.
Leaking cylinder
A puddle or a drip under the cylinder can come from a connection or from the tank itself. A leak at a connection can be repaired. A tank pitted through by corrosion cannot, and has to be replaced. While you wait for us, switch the cylinder off at the fuse box and close its water inlet valve, so the water does not reach the electrical parts.
Cylinder servicing
Many cylinder faults start with limescale and corrosion, which build up slowly and silently. During a service we clear the limescale, check the magnesium anode, the part that wears away to protect the tank, and make sure the element, the thermostat and the connections are in good order.
Looking after the anode is what extends the life of the tank most. The right interval depends on how hard the water is and how much hot water the household uses, so on the first visit we tell you what makes sense for your home. You book it like any other job, by phone or WhatsApp, at a time that suits you.
Repair or replace: how we decide with you
Not every cylinder is worth repairing, and when it is not we tell you plainly, even if that means a smaller job for us.
We look at the tank first, because corrosion inside cannot be undone, however simple the failed part is to change. Then at the age of the appliance and how many faults it has had. With that on the table we give you both options and a quote for each, and the decision is yours. If you rent, the quote is written so you can forward it to your landlord before we go ahead.
New cylinder installation
When the choice is to replace, we help you pick the size of the new cylinder for the number of people at home and the space available. For a water tank replacement we fit the new cylinder with the water and electrical connections done properly, fill it and only switch it on once we have checked there are no leaks.
Cylinder or water heater: which one do you have
A cylinder heats water with electricity and stores it in a tank. A gas water heater, the esquentador found in many Porto kitchens, heats the water as you open the tap and has no tank. If your appliance is small, wall mounted and lights a flame when you run the hot tap, what you need is water heater repair in Porto. If the same appliance also heats the radiators, it is a boiler and the right service is boiler repair in Porto. If you are not sure, send a photo on WhatsApp and we will tell you.
What our hot water cylinder repair covers
- Cylinder not heating the water
- Electric element and thermostat
- Magnesium anode and tank protection
- Limescale removal and servicing
- Leaks in the tank and at connections
- Cylinder installation and replacement
- Sizing for the household
How the repair goes, from the first call to the invoice
Being without hot water is a nuisance at any hour. Knowing what comes next helps, and the path is always the same, day or night.
You call or send a message
A person answers. We ask for your full address, what is happening and, if possible, a photo of the cylinder and of where it is installed. With that we tell you what is likely and how long we will take to get there.
We agree the visit
We confirm the arrival time and how you would like to pay while still on the phone, so there are no misunderstandings at the door. If water is coming from the tank, we tell you how to switch the cylinder off and close the water while you wait.
We diagnose at your home
The technician checks the power supply, the element, the thermostat and the water connections until the cause is found. They explain what they see in plain words and show you the part when it is the culprit.
You get the quote before we start
We tell you what needs doing, what it costs and how long it takes. If the repair is not worth it, we say so and quote for a new cylinder too. Nothing goes ahead without your approval.
We repair and test in front of you
We replace the part, refill the tank and switch the cylinder back on, checking that it starts heating and that the connections stay dry. If the part has to be ordered, we tell you how long it will take rather than inventing a date.
You keep the invoice and our number
The invoice lists the work and the parts used. That document is your guarantee and what entitles you to complain if anything fails. If the cylinder gives trouble again, you call the same number.
Hot water cylinder questions
The hot water runs out very quickly. Why?
Usually limescale settled at the bottom, taking up the space the water should fill. We clear it and check the anode at the same time.
How long does a cylinder last?
It depends heavily on water hardness and on whether the anode has been replaced. Anode maintenance is what extends tank life most.
Is a leaking cylinder worth repairing?
If the leak is at a connection, yes. If the tank is pitted through by corrosion there is no repair and it is replaced.
How much does a hot water tank repair cost?
It depends on the fault and the part, which is why we do not give prices over the phone without seeing the appliance. The quote is free and given on site, before any work.
Do you come out at night or at weekends?
Yes. We answer 24 hours a day, every day of the year. No hot water on a Sunday night is exactly the kind of call we take.
Hot water cylinder repair across Greater Porto
We repair hot water cylinders in every municipality of Greater Porto. In many homes the cylinder was fitted wherever there was room, in a cupboard, an attic or an enclosed balcony, and in others it sits above the bathroom false ceiling. In Porto, Gaia, Matosinhos, Maia or anywhere else in the area, tell us on the phone where yours is, so we arrive ready to reach it.