Johnson and Starley BOS01242 Thermista-Stat – Hispec/MAF/JT19-25

Description

Johnson and Starley BOS01242 Thermista-Stat – Hispec/MAF/JT19-25

Johnson & Starley Boiler Spares replacement part with manufacturer part number BOS01242. This exact item is a genuine, brand-new Johnson & Starley Boiler Spares product. It is intended for the compatible appliances shown below, where listed. Match the boiler model and MPN before ordering.

Product Details

Brand: Johnson & Starley Boiler Spares
Manufacturer part number (MPN): BOS01242
Condition: Genuine brand new

Boiler Compatibility

Check the exact appliance model and manufacturer part number before ordering.

This part fits the following 150 appliances:

Listed compatible appliances

• Johnson & Starley Boiler Spares AQUAIR 40
• Johnson & Starley Boiler Spares AQUAIR 80
• Johnson & Starley Boiler Spares AQUAIR UNIVERSAL
• Johnson & Starley Boiler Spares HI-SPEC JU55 WARM AIR PROPANE
• Johnson & Starley Boiler Spares HI-SPEC JU55 WARM AIR PROPANE
• Johnson & Starley Boiler Spares HISPEC 20 WARM AIR NG
• Johnson & Starley Boiler Spares HISPEC J20 WARM AIR
• Johnson & Starley Boiler Spares HISPEC J30 WARM AIR NG
• Johnson & Starley Boiler Spares HISPEC J50 WARM AIR NG
• Johnson & Starley Boiler Spares HISPEC J50 WARM AIR PROPANE
• Johnson & Starley Boiler Spares HISPEC J65 WARM AIR NG
• Johnson & Starley Boiler Spares HISPEC J90 WARM AIR NG
• Johnson & Starley Boiler Spares J15-22 WARM AIR NG
• Johnson & Starley Boiler Spares J15-22 JAN WARM AIR NG
• Johnson & Starley Boiler Spares J15-22 MAF WARM AIR NG
• Johnson & Starley Boiler Spares J15-22 MAF-JAN WARM AIR NG
• Johnson & Starley Boiler Spares J15-22 MK3 WARM AIR NG
• Johnson & Starley Boiler Spares J15-22 MK3-ELJ WARM AIR NG
• Johnson & Starley Boiler Spares J15-22 MK3-HIJ WARM AIR NG
• Johnson & Starley Boiler Spares J15-22 MK3-JAN WARM AIR NG
• Johnson & Starley Boiler Spares J15-22 MK3-MAF VI WARM AIR NG
• Johnson & Starley Boiler Spares J15-22 MK3-MAF WARM AIR NG
• Johnson & Starley Boiler Spares J15-22 MK3-MAF-ELJ WARM AIR NG
• Johnson & Starley Boiler Spares J15-22 MK3-MAF-HIJ WARM AIR NG
• Johnson & Starley Boiler Spares J15-22 MK3-MAF-JAN WARM AIR NG
• Johnson & Starley Boiler Spares J15-22 MK3-MAFVIELJ WARMAIR NG
• Johnson & Starley Boiler Spares J15-22 MK3-MAFVIHIJ WARMAIR NG
• Johnson & Starley Boiler Spares J15-22 MK3-MAFVIJAN WARMAIR NG
• Johnson & Starley Boiler Spares J15-22R WARM AIR NG
• Johnson & Starley Boiler Spares J15-22R JAN WARM AIR NG
• Johnson & Starley Boiler Spares J15-22R MAF WARM AIR NG
• Johnson & Starley Boiler Spares J15-22R MAF-JAN WARM AIR NG
• Johnson & Starley Boiler Spares J15-22R MK3 WARM AIR NG
• Johnson & Starley Boiler Spares J15-22R MK3-ELJ WARM AIR NG
• Johnson & Starley Boiler Spares J15-22R MK3-HIJ WARM AIR NG
• Johnson & Starley Boiler Spares J15-22R MK3-JAN WARM AIR NG
• Johnson & Starley Boiler Spares J15-22R MK3-MAF VI WARM AIR NG
• Johnson & Starley Boiler Spares J15-22R MK3-MAF WARM AIR NG
• Johnson & Starley Boiler Spares J15-22R MK3-MAF-ELJ WARMAIR NG
• Johnson & Starley Boiler Spares J15-22R MK3-MAF-HIJ WARMAIR NG
• Johnson & Starley Boiler Spares J15-22R MK3-MAF-JAN WARMAIR NG
• Johnson & Starley Boiler Spares J15-22R MK3MAFVIELJ WARMAIR NG
• Johnson & Starley Boiler Spares J15-22R MK3MAFVIHIJ WARMAIR NG
• Johnson & Starley Boiler Spares J15-22R MK3MAFVIJAN WARMAIR NG
• Johnson & Starley Boiler Spares J25-32 AIR HEATER WARM AIR NG
• Johnson & Starley Boiler Spares J25-32 JAN WATER HEATER NG
• Johnson & Starley Boiler Spares J25-32 MAF WARM AIR NG
• Johnson & Starley Boiler Spares J25-32 MAF-JAN WARM AIR NG
• Johnson & Starley Boiler Spares J25-32 MK2 WARM AIR NG
• Johnson & Starley Boiler Spares J25-32 MK2-JAN AIR/WATER NG
• Johnson & Starley Boiler Spares J25-32 MK2-MAF WARM AIR NG
• Johnson & Starley Boiler Spares J25-32 MK2MAF JAN AIR/WATER NG
• Johnson & Starley Boiler Spares J25-32 MK3 WARM AIR NG
• Johnson & Starley Boiler Spares J25-32 MK3-ELJ WARM AIR NG
• Johnson & Starley Boiler Spares J25-32 MK3-HIJ WARM AIR NG
• Johnson & Starley Boiler Spares J25-32 MK3-JAN WARM AIR NG
• Johnson & Starley Boiler Spares J25-32 MK3-MAF VI WARM AIR NG
• Johnson & Starley Boiler Spares J25-32 MK3-MAF WARM AIR NG
• Johnson & Starley Boiler Spares J25-32 MK3-MAF-ELJ WARM AIR NG
• Johnson & Starley Boiler Spares J25-32 MK3-MAF-HIJ WARM AIR NG
• Johnson & Starley Boiler Spares J25-32 MK3-MAF-JAN WARM AIR NG
• Johnson & Starley Boiler Spares J25-32 MK3-MAFSPRJN WARMAIR NG
• Johnson & Starley Boiler Spares J25-32 MK3-MAFVIELJ WARMAIR NG
• Johnson & Starley Boiler Spares J25-32 MK3-MAFVIHIJ WARMAIR NG
• Johnson & Starley Boiler Spares J25-32 MK3-MAFVIJAN WARMAIR NG
• Johnson & Starley Boiler Spares J25-32 MK3-MAFVLSPJ WARMAIR NG
• Johnson & Starley Boiler Spares J25-32 MK3-SUPERJAN WARMAIR NG
• Johnson & Starley Boiler Spares J25-32 R-JAN RVCAT1 WARMAIR NG
• Johnson & Starley Boiler Spares J25-32R MK3-MAF-HIJ HEATER NG
• Johnson & Starley Boiler Spares J25-32R AIR HEATER WARM AIR NG
• Johnson & Starley Boiler Spares J25-32R JAN AIR/WATER NG
• Johnson & Starley Boiler Spares J25-32R MAF WARM AIR NG
• Johnson & Starley Boiler Spares J25-32R MAF-JAN AIR/WATER NG
• Johnson & Starley Boiler Spares J25-32R MK2 WARM AIR NG
• Johnson & Starley Boiler Spares J25-32R MK2-JAN AIR/WATER NG
• Johnson & Starley Boiler Spares J25-32R MK2-MAF WARM AIR NG
• Johnson & Starley Boiler Spares J25-32R MK2MAFJAN AIR/WATER NG
• Johnson & Starley Boiler Spares J25-32R MK3 WARM AIR NG
• Johnson & Starley Boiler Spares J25-32R MK3-ELJ WARM AIR NG
• Johnson & Starley Boiler Spares J25-32R MK3-HIJ WARM AIR NG
• Johnson & Starley Boiler Spares J25-32R MK3-JAN WARM AIR NG
• Johnson & Starley Boiler Spares J25-32R MK3-MAF WARM AIR NG
• Johnson & Starley Boiler Spares J25-32R MK3-MAF-ELJ WARMAIR NG
• Johnson & Starley Boiler Spares J25-32R MK3-MAF-JAN HEATER NG
• Johnson & Starley Boiler Spares J25-32R MK3-MAFSUPERJAN HTR NG
• Johnson & Starley Boiler Spares J25-32R MK3-MAFVI WARM AIR NG
• Johnson & Starley Boiler Spares J25-32R MK3-MAFVI-ELJ HTR NG
• Johnson & Starley Boiler Spares J25-32R MK3-MAFVI-HIJ HTR NG
• Johnson & Starley Boiler Spares J25-32R MK3-SUPERJAN HEATER NG
• Johnson & Starley Boiler Spares J25-32R MK3MAFVIJAN WARMAIR NG
• Johnson & Starley Boiler Spares J25-32R MK3MAFVLSPJ WARMAIR NG
• Johnson & Starley Boiler Spares J25-32R REVER CAT 1 WARMAIR NG
• Johnson & Starley Boiler Spares J54/64 J54-64 AIR/WATER NG
• Johnson & Starley Boiler Spares J54/64 J54-64 MAF WARM AIR NG
• Johnson & Starley Boiler Spares J54/64 J54-64 MAFVI WARMAIR NG
• Johnson & Starley Boiler Spares J54/64 J54-64 WARM AIR NG
• Johnson & Starley Boiler Spares J54/64 MAF-JAN WARMAIR NG
• Johnson & Starley Boiler Spares J55-65 WARM AIR HEATER NG
• Johnson & Starley Boiler Spares J70-90 MK2 HEATER NG
• Johnson & Starley Boiler Spares J70-90 MK2-MAF WARMAIR HEATR N
• Johnson & Starley Boiler Spares J70/90 J70-90 WARM AIR NG
• Johnson & Starley Boiler Spares JA33-43 HEATER NG
• Johnson & Starley Boiler Spares JA33-43 MAF VI HEATER NG
• Johnson & Starley Boiler Spares JA33-43-JAN HEATER NG
• Johnson & Starley Boiler Spares JA33-43-MAF HEATER NG
• Johnson & Starley Boiler Spares JA33-43-MAF VI-JAN HEATER NG
• Johnson & Starley Boiler Spares JA33-43-MAF-JAN HEATER NG
• Johnson & Starley Boiler Spares JA33-43R HEATER NG
• Johnson & Starley Boiler Spares JA33-43R-JAN HEATER NG
• Johnson & Starley Boiler Spares JA33-43R-MAF HEATER NG
• Johnson & Starley Boiler Spares JA33-43R-MAF VI HEATER NG
• Johnson & Starley Boiler Spares JA33-43R-MAF VI-JAN HEATER NG
• Johnson & Starley Boiler Spares JA33-43R-MAF-JAN HEATER NG
• Johnson & Starley Boiler Spares JB16-20 HEATER NG
• Johnson & Starley Boiler Spares JB25-30
• Johnson & Starley Boiler Spares JB25-30 HEATER NG
• Johnson & Starley Boiler Spares JB25-30 MAF HEATER NG
• Johnson & Starley Boiler Spares JB40-50 HEATER NG
• Johnson & Starley Boiler Spares JB40-50 MAF HEATER NG
• Johnson & Starley Boiler Spares JB40-50-ELJ HEATER NG
• Johnson & Starley Boiler Spares JB40-50-MAF-ELJ HEATER NG
• Johnson & Starley Boiler Spares JT19-25 MAF VI HEATER NG
• Johnson & Starley Boiler Spares JT19-25 WARMAIR HTR NG
• Johnson & Starley Boiler Spares JT19-25 JAN HEATER NG
• Johnson & Starley Boiler Spares JT19-25 MAF HEATER NG
• Johnson & Starley Boiler Spares JT19-25 MAF IV-JAN HEATER NG
• Johnson & Starley Boiler Spares JT19-25 MAF-JAN HEATER NG
• Johnson & Starley Boiler Spares JT19-25 MK2 HEATER NG
• Johnson & Starley Boiler Spares JT19-25 MK2-ELJ HEATER NG
• Johnson & Starley Boiler Spares JT19-25 MK2-HIJ HEATER NG
• Johnson & Starley Boiler Spares JT19-25 MK2-JAN HEATER NG
• Johnson & Starley Boiler Spares JT19-25 MK2-MAF HEATER NG
• Johnson & Starley Boiler Spares JT19-25 MK2-MAF VI HEATER NG
• Johnson & Starley Boiler Spares JT19-25 MK2-MAF VI-JAN HTR NG
• Johnson & Starley Boiler Spares JT19-25 MK2-MAF-ELJ HEATER NG
• Johnson & Starley Boiler Spares JT19-25 MK2-MAF-HIJ HEATER NG
• Johnson & Starley Boiler Spares JT19-25 MK2-MAF-JAN HEATER NG
• Johnson & Starley Boiler Spares JT19-25 MK2-MAFSUPERJAN HTR NG
• Johnson & Starley Boiler Spares JT19-25 MK2-MAFVI-ELJ HTR NG
• Johnson & Starley Boiler Spares JT19-25 MK2-MAFVI-HIJ HTR NG
• Johnson & Starley Boiler Spares JT19-25 MK2-MAFVL-S/JAN HTR NG
• Johnson & Starley Boiler Spares JT19-25 MK2-SUPERJAN HEATER NG
• Johnson & Starley Boiler Spares JTRS22-25 JAN AIR/WATER NG
• Johnson & Starley Boiler Spares JTRS22-25 MAFVI-JAN AIR&W
• Johnson & Starley Boiler Spares JTRS22-25 MK2-MAFV1-JAN3SEL WH
• Johnson & Starley Boiler Spares JU40-55
• Johnson & Starley Boiler Spares JWD25/ JWD25 MKII RVTD 1B WH
• Johnson & Starley Boiler Spares JWD38-50
• Johnson & Starley Boiler Spares Q44
• Johnson & Starley Boiler Spares SCS25 MK1 WATER HEATER

Ordering and support

Before you order

Use the manufacturer part number as your main check. Do not rely on a similar-looking part.

Technical FAQs

How do I check that this is the correct replacement part?

Use manufacturer part number BOS01242 as the main check. Match it to the old part or appliance documentation, not only to a similar-looking product.

Will this part fit my boiler?

This exact part is listed for 150 appliance model(s). Check your appliance model, MPN and the GC Number tab before ordering.

Can a similar-looking part be used instead?

Do not rely on shape or appearance alone. Check the manufacturer part number and the exact appliance model before ordering a replacement.

Does the part number identify the cause of a boiler fault?

No. A part number helps identify a replacement item but does not diagnose a fault. Ask a suitably qualified professional to identify the cause where required.

Who should fit and test this part?

Installation and testing should be completed by a suitably qualified professional where required. This exact item is a genuine, brand-new Johnson & Starley Boiler Spares product.

Related Johnson & Starley Boiler Spares parts

Browse related Johnson & Starley Boiler Spares Boiler Accessories.

Help and returns

For help checking this part, message us on WhatsApp. This item includes a 12-month warranty. Returns are subject to the 30-day returns policy.

Product check

Clear identification matters. Check the manufacturer part number before you order.

Installation and testing should be completed by a suitably qualified professional where required.