"Clash of the Choirs"
- Master heaters heat up the participants

Clash of the Choirs, the biggest music show on Polish Television this spring, attracted a great number of viewers. Huge scale and riveting emotions were the result of many months of work. MTM Dariusz Seferyński from Warsaw also contributed to the atmosphere on the set by providing Master heaters to heat the studio.

The set for the show was built in a huge production hall in the Ursus plant, the former tractor manufacturer. A special zone where the show took place was sectioned off using ceiling-to-floor curtains. The room created this way has a volume of over 44.000 m³.

When preparations for the show started, the temperature in the hall was as low as approx. 3°C. With stage lights and full audience, the temperature increased to 8°C. Initially, using eight Master BV 690 heaters was considered to evenly heat the place. The devices were to be placed outside the building, as well as inside, behind the curtains. Finally, the producers decided to go with the alternative solution of two heaters to create “islands of heat”.

Two 220 kW Master BV 690 oil-fired heaters with exhaust venting were placed indoors, behind the curtains. Hot air was then channelled using 5 m by 710 mm distribution tubes. Only one tube was used, instead of four, to provide even and effective blowing (Master BV 690 heaters have 4 air outlets, so four 200 mm tubes can be connected).

The zones near the ends of the tubes, called heat islands, were located near the performance spaces and the jury space.

Using only two heaters, the producers managed to reach temperatures of 18-21°C in the heat islands and 13-15°C elsewhere. Temperature levels varied slightly depending on the weather conditions outside.

It is worth noting, that the temperature was hugely increased in an enormous structure at a relatively low cost. A satisfactory effect was achieved using only two heaters with a hot air flow of 12.500 m³ per device.

MTM used 600-l oil tanks to provide continuous operation two days a week without the need for refill. The hall was heated every Friday for rehearsals and then on Saturdays for rehearsal and live broadcasts. In the case of Master BV 690, 60 litres of fuel are sufficient for 3 hours of operation of one device.

The aforementioned installation, consisting of two Master heaters, proved to be sufficient to heat an enormous hall, which shows how effective they are. Similar installations could surely be used for other temporary events.