A gas water heater is the most common hot water solution in Barcelona flats without a central heating boiler: it heats water instantly, with no storage tank, and only consumes gas when there is demand. The difference between models is not the brand — it is the output, the flue type and whether the building has a chimney or a direct external outlet for exhaust gases.
At JAG Alcaide we are an official Junkers Bosch SAT (Technical Assistance Service) in Barcelona. We supply and install the full Bosch Therm 6600 water heater range (formerly Junkers Hydronext), and we make sure the chosen model is the right one for your property: output matched to the number of occupants, flue type compatible with the existing installation, and connection compliant with current gas regulations.
We can help you decide between different varieties of heaters, depending on their heating capacity, their way of evacuating the gases that are produced inside the water heater while it’s working, and the ignition type that you require.
Our favorite brand of water heaters is Junkers, since not only they save a lot of space because of their small size, but they also offer higher power and performance than the old water heaters, allowing the water to be heated depending on the particular needs of your house.
We will help you on choosing the most appropriate water heater for your house. We will take in account different characteristics that might be very important for the selection of your water heater: the amount of people who live in the house, the amount of water you usually consume, the amount of taps that are installed in your house or the number of rooms that you have.
| Situation | Recommended model | Why |
|---|---|---|
| Flat for 1–2 people, 1 bathroom | Bosch Therm 6600 S 12 — €940 | Sufficient output for low demand. Most affordable price point |
| Flat for 3–4 people, 1–2 bathrooms | Bosch Therm 6600 S 15 — €1,000 | Sufficient flow for simultaneous shower and kitchen use |
| Flat for 4+ people or high consumption | Bosch Therm 6600 S 17 — €1,100 | Higher output for simultaneous peak demand |
| No chimney or external outlet | Sealed flue models only (all models on this page) | Sealed flue units draw air from outside and need no chimney |
| Tight budget | Bosch Therm 6600 S 12 | The most affordable model in the range, with the same official Bosch warranty |
Not sure which model you need? Call us before ordering — in 5 minutes we can tell you exactly which model suits your flat and why.
What does installation include?
The equipment price includes the water heater with VAT. Installation is quoted separately based on each property’s specifics: gas connection length, flue type and whether the exhaust outlet needs adapting for the new unit. In most like-for-like replacements at the same location, installation is straightforward and the work is completed in a few hours.
As an official Junkers Bosch SAT, our installation automatically activates the full manufacturer’s warranty. Buying the unit from a retailer and having it installed by a third party is not the same — in that case the warranty may be conditional on the installation having been carried out by an authorised service centre.
Frequently asked questions about gas water heaters in Barcelona
How much does it cost to install a gas water heater in Barcelona?
The unit costs between €940 and €1,100 depending on the model (VAT included). Installation is quoted separately: for a standard like-for-like replacement, without modifying the flue or gas supply, installation typically ranges from €150 to €300. We provide the exact quote at the free preliminary visit.
What is the difference between Junkers and Bosch?
None as far as the manufacturer goes: Junkers and Bosch are the same company, and for some years now the water heaters have been sold under the Bosch name. The Bosch Therm 6600 range is the direct continuation of the old Junkers Hydronext, with the same official service centre and the same parts. If you have an older Junkers or Neckar at home, we still repair and service it as normal.
What is a sealed flue water heater and why is it required in flats without a chimney?
A sealed flue water heater has a coaxial double pipe that draws combustion air from outside and expels exhaust gases back outside, without using any air from inside the property. It is mandatory in any installation without a chimney or natural flue — which is the most common situation in renovated Barcelona flats. All models on this page are sealed flue.
How long does installation take?
A standard like-for-like replacement takes 2–4 hours. If the flue needs modifying or the gas supply needs adapting, the work may take half a day. In all cases we leave the installation running and checked on the same day.
Does installation activate the manufacturer’s warranty?
Yes. As an official Junkers Bosch SAT, our installation automatically activates the full manufacturer’s warranty. If the unit is installed by an unauthorised technician, the warranty may be limited or voided under the manufacturer’s terms.
Do you also carry out servicing and repairs?
Yes. We carry out the annual servicing recommended by the manufacturer and repair breakdowns on any Junkers or Neckar model. We also offer a maintenance contract covering the annual service and labour for callouts. See our maintenance contracts page →
Does your flat also have heating or are you thinking of installing it? If you need hot water and heating in a single unit, a mural boiler is more efficient than a standalone water heater. See our Junkers boilers in Barcelona page → or our gas boiler installation page →.