A genuine Worcester Bosch part, this thermistor is designed for use in Greenstar, Greenstar ErP, CBi Series, CDi Series, Highflow, i Junior Series, SBi Series, Si/C1 Series and RD Series boilers. The thermistor decreases circuit resistance in line with temperature increases. A boiler's printed control board (PCB) sends a current to the thermistor, deciding whether a decrease or increase in heat is required by reading the relative resistance.

Worcester NTC / Thermister DHW 87161423020

Compatible with the following boilers: GREENSTAR HIGHFLOW 440 - 7715330037, GREENSTAR HIGHFLOW 550CDI - 7715330040, GREENSTAR HIGHFLOW 440CDI - 7715330041, GREENSTAR HIGHFLOW 550CDI - 7715330052, GREENSTAR HIGHFLOW 440CDI - 7715330053, HIGHFLOW HIFLO400 ELECTRONIC-FSN-GB NAT GAS - 7716120008, HIGHFLOW HIFLO400 ELECTRONIC-BSN-GB NAT GAS - 7716120009, HIGHFLOW HIFLO400 ELECTRONIC-OSN-GB NAT GAS - 7716120010, HIGHFLOW HIFLO400 ELECTRONIC-FSP-GB NAT GAS - 7716120011, 24CDI-BSN-GB NAT GAS COMBI - 7716130012, 26CDi XTRA-GB NAT GAS - 7716130042, 26CDi XTRA-GB LPG - 7716130043, 35CDI-FSN-GB NAT GAS COMBI - 7716130044, 35CDI-FSP-GB LPG GAS COMBI - 7716130045, 15SBI-FSN-GB NAT GAS SYSTEM BOILER - 7716130046, 24SBI-FSN-GB NAT GAS SYSTEM BOILER - 7716130047, 28SI-FSN-GB NAT GAS COMBI - 7716130055, 28SI-FSP-GB LPG COMBI - 7716130056, 28SI-FSP-GB LPG COMBI - 7716130056, 24SI II-FSN-GB NAT GAS COMBI - 7716130088, 28SI II-FSN-GB NAT GAS COMBI - 7716130089, RD628 RSF - 7716130090, 24CBI-FON-GB NG BOILER - 7716130095, 15CBI-FON-GB NG BOILER - 7716130096, 28CDI-FSN-GB NAT GAS COMBI - 7716130103, 35CDI II-FSN-GB NAT GAS COMBI - 7716130105, 35CDI II-FSP-GB LPG COMBI - 7716130108, 9/14 CBI-FON-GB NG BOILER - 7716130110, 9/14 CBI-FOP-GB LPG BOILER - 7716130111, 14/19 CBI-FON-GB NG BOILER - 7716130112, 14/19 CBI-FOP-GB LPG BOILER - 7716130113, 19/24 CBI-FON-GB NG BOILER - 7716130114, 19/24 CBI-FOP-GB LPG BOILER - 7716130115, 24CDI-FSN-GB NAT GAS COMBI - 7716130122, 24CDI-FSP-GB LPG COMBI - 7716130123, 25SI-FSN-GB NAT GAS COMBI - 7716130129, 25SI-FSP-GB LPG COMBI - 7716130130, 28CDI - FSP - GB LPG COMBI - 7716130131, 26CDI-FSN-GB NAT GAS CONDENSING - 7716130132, 24I JUNIOR-FSN-GB NAT GAS COMBI - 7716130133, 24I JUNIOR-FSP-GB LPG COMBI - 7716130134, 28I JUNIOR-FSN-GB NAT GAS COMBI - 7716130135 & 28I JUNIOR-FSP-GB LPG COMBI - 7716130136.