If, after bleeding, the radiator still heats inefficiently, there are other, more serious possible causes. Sludge accumulation is the primary one. Over the years, the water in the heating circuit generates oxides and mineral residues that settle in the radiators, especially at the bottom. This sludge reduces the useful cross-section for water flow and creates cold spots. The solution is a complete chemical flush of the circuit with a specific descaling product, which is introduced with the boiler off and circulated for a few hours. It is completely drained before refilling with new water treated with a corrosion inhibitor. Call us, message us on WhatsApp, or request your quote online — we'll respond in under 10 minutes during business hours. Call us, message us on WhatsApp, or request your quote online — we'll respond in under 10 minutes during business hours.

Deep cleaning of the heating circuit water with a specific descaler to remove sludge and oxides. This is done every 7-10 years or when persistent cold spots occur. For flats with a centralised community boiler, the combination of thermostatic heads and individual consumption meters allows residents to pay exactly for the heating consumed by each home, which is much fairer than the proportional distribution by surface area used when there are no meters. This is an obligatory improvement in many communities due to European regulations. Installing thermostatic heads on each radiator is a very cost-effective improvement. Each room has its own independent temperature control, allowing different temperatures to be maintained according to use (warmer in the living room when occupied, cooler in an unused guest room) and saving energy without sacrificing comfort. Installation is simple when radiators already have conventional valves: we replace the manual head with a thermostatic one.

Low water content aluminium radiators are the most efficient for most modern installations. They heat up quickly, cool down quickly, and allow for precise time programming without penalising comfort. Tubular panel steel radiators are a common alternative with good value for money. For bathrooms, we recommend towel rail radiators that combine room heating with towel drying. 400 euros for an installed condensing boiler, depending on brand, power, and necessary work. Replacement usually pays for itself in 4-6 years due to gas savings. Annual gas boiler maintenance, between 90 and 130 euros including certificate. Repair of a simple fault (sensor, valve, pressure switch), 80-180 euros plus parts. Complete replacement of a natural gas boiler with a condensing model, 1,400 euros including installation depending on brand and power.

The price of annual maintenance in Sants usually ranges between 160 and 4165 euros. The final figure depends on the property's condition, materials, and labour time. We always provide a fixed quote before starting. A complete aerothermal installation is a serious project. It starts with calculating the thermal loads of the home, sizing the equipment according to real needs, choosing between radiators only, underfloor heating only, or a combination, planning space for the domestic hot water tank and outdoor unit, and a fixed quote. Call us, message us on WhatsApp, or request your quote online — we'll respond in under 10 minutes during business hours.