If the radiator still heats incorrectly after purging, 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 in their lower part. This sludge reduces the useful flow section of the water and creates cold spots. The solution is chemical flushing of the entire 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 respond in less than 10 minutes during business hours. Call us, message us on WhatsApp, or request your quote online — we respond in less than 10 minutes during business hours.

A very cost-effective improvement is to install thermostatic heads on each radiator. 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 losing comfort. Installation is simple when radiators already have conventional valves: we replace the manual head with a thermostatic one. Deep cleaning of the heating circuit water with specific descaler to eliminate sludge and oxides. This is done every 7-10 years or when persistent cold spots occur. The second frequent cause is a blocked or faulty thermostat valve. Modern valves with thermostatic heads have an internal pin that can seize up after months of disuse (which happens every summer in the Costa Blanca area when heating is not used). To prevent this, it is advisable to move the thermostatic heads to their maximum and minimum settings every couple of months during the off-season. If the valve is blocked, the head is disassembled, the pin is freed with a very gentle tap, or we replace the entire valve.

Low-water content aluminium radiators are the most efficient for most modern installations. They heat up quickly, cool down quickly, and allow fine hourly programming without sacrificing 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. Official manufacturer's warranty (5-7 years) plus our coverage on labour. Electric underfloor heating for a 90 m² home is around 4,000 euros with zone thermostats. We replace individual new radiators for 80-180 euros each depending on size and model. Programmable thermostat with installation, 120-280 euros depending on brand.

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