Checking hours…Mon–Fri 7:30am–5pm · Sat 9am–12pm01302 279234Trade account
Sime Rear Insulation Combustion Chamber 6139790

Sime

Sime Rear Insulation Combustion Chamber 6139790

Rear combustion chamber insulation panel, part 6139790, for Sime Format, Climit, Metropolis and Open series boilers.

Manufacturer part no.
6139790
Showing prices

£10.78

£8.98 ex. VAT · VAT at 20%

Available to order · 3 working days
Available to order · 3 working days
Not certain it's the right part? The technical team verifies fitment before dispatch — no charge, and it stops a second trip.Call the technical teamSend a technical question

Same-day dispatch

Ordered by 4pm Mon–Fri, 10:30am Sat.

30-day returns

Unused, in original packaging.

What it is

The rear insulation panel for the combustion chamber, manufactured by Sime under part number 6139790. It sits at the rear of the combustion chamber on Sime Format 100B and related boiler families, shielding the casing from combustion heat and limiting heat loss from the chamber. It is a serviceable insulation component, replaced when the original material degrades.

Signs this part needs replacing

  • Insulation material cracked, crumbling or breaking away from the rear panel
  • Discolouration, scorching or blackening of the insulation surface
  • Insulation fragments found loose inside the combustion chamber or flue ways
  • Localised heat damage or discolouration to the rear casing behind the panel
  • Panel distorted or no longer seated correctly against the chamber wall

Before you order

  • Confirm your boiler model against the fit list above, including the LPG or natural gas variant
  • Check the existing rear panel for damage before ordering, as other insulation panels may also need replacing
  • Verify the part number 6139790 matches the number shown in the manufacturer's parts list for your appliance
  • Isolate the appliance and allow it to cool before inspection or removal of any combustion chamber insulation

Not sure which part?

Search by part number, product name or brand — our technical team confirms fitment before anything is dispatched.