Ключевые слова: 3d, 3d rendering, apartment, autonomous gas heating, central heating system, concept, conservation, consumption, control, convection, convective, cost, country, distribution, domestic, economy, efficiency, energy, equipment, flag, heating radiator, heating system, hot, household, illustration, interior, national, poland, polish heating, price, room, saving, service, technology, temperature, thermal, thermostat, thermostatic, valve, wall, warmth,