Not required., GAS BOILER_UC / GAS BOILER_FE 24.4-33.4 - four-pipe condensing boiler for hybrid heat pumps., KCSAFX - ø60/100 mm vertical coaxial fitting., CCOAX - 90° coaxial elbow for ø60/100 mm horizontal outlet that can be adjusted at 360°., TCOAX - L1000 mm ø60/100 coaxial pipe with terminal., KAS80X - ø80 mm vertical fittings., KSDFX - ø80 mm flue gas splitter kit., VDACSX - Thermostatic switching valve for domestic water., GAS BOILER_UC 70.2-115.2-200F.2 - two-pipe condensing boiler for hybrid heat pumps., INAILX - INAIL safety kit for installation of single boiler., FH100X - ø100 mm vertical flue gas terminal., HIDUCX - Remote control for UC 70.2-115.2 boilers., IBH - Integrated back-up heater., IBHX - Back-up electric heater (single-phase)., IBHTX - Back-up electric heater (three-phase)., ACS200X - 200-litre DHW boiler., ACS300X - 300-litre DHW boiler., ACS500X - 500-litre DHW boiler., ACS1000X - 1000-litre DHW boiler., ACS10SX - 1.000-litre DHW boiler with solar coil., SCS08X - Solar coil for ACS200X/ACS300X DHW boilers., SCS12X - Solar coil for ACS ACS500X DHW boilers., QERAX - Connection kit for single-phase heater on DHW storage tank (for ACS200/300/500X)., QERATX - Connection kit for three-phase heater on DHW storage tank (for ACS1000X)., 3DHWX - System/DHW three-way switching valve (SV1)., PRSX - DHW recirculation pump., ELFOSun³., TANKX - System inertial storage tank., KTCAX - Hose kit for connecting the unit to the inertial storage tank., DIX - one-litre hydraulic circuit breaker., DI50-2X - 50-litre hydraulic circuit breaker., DI100X - 100-litre hydraulic circuit breaker., KCSX - Secondary circuit kit (1-litre hydraulic circuit breaker + pump)., KIRE2HX - Double zone distribution unit: direct + direct., KIRE2HLX - Double zone distribution unit: direct + mixed (with mixing valve)., PCSX - Circulation pump for secondary circuit., PCS2X - Oversized circulation pump for secondary circuit., KTFLX - Hose kit for connection to the unit., FDMX - Magnetic dirt separator filter for water distribution systems., VAGX - Safety antifreeze valve for system., DTX - Drain pan with electric heater., T1BX - DHW temperature probe and additional heating source at 10 m., T1B30X - DHW temperature probe and additional heating source at 30 m., AMRX - Kit of antivibration mounts for floor installation., AMMSX - Kit of anti-seismic antivibration mounts for floor installation., ASTFX - Kit of antivibration mounts for installation on wall brackets, inertial storage tank or tray., KSIPX - Wall fixing bracket kit., HTC2WX - HID-TConnect two white chronothermostat for temperature control., SWCX - IoT SwitchConnect receiver / switch., ELFOControl³ EVO.