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Vokera Gas Valve SIT 845 Sigma 0.845.057

Vokera

Vokera Gas Valve SIT 845 Sigma 0.845.057

Gas valve for Vokera Aquanova and EASI-FLO boilers, part number SIT 845 Sigma 0.845.057.

At a glance

  • Also known as 1533960
  • This is a gas-carrying component; installation must be carried out by a Gas Safe registered engineer.
Manufacturer part no.
20007784
Showing prices

£133.10

£110.92 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 SIT 845 Sigma 0.845.057 is a gas valve manufactured by Vokera for use in their Aquanova and EASI-FLO boiler ranges. It controls the flow of gas to the burner, opening and closing in response to demand from the boiler's control system. This component is critical for safe ignition and modulation of the flame.

Signs this part needs replacing

  • Boiler fails to ignite or repeatedly locks out
  • No gas supply reaching the burner
  • Intermittent or weak flame
  • Flame cuts out shortly after ignition
  • Error codes relating to ignition or flame detection

Before you order

  • Confirm your boiler model matches one listed in the Fits section.
  • Check the existing gas valve part number (SIT 845 Sigma 0.845.057) before ordering.
  • This is a gas-carrying component; installation must be carried out by a Gas Safe registered engineer.
  • Verify the boiler code or GC number if available, as variants exist.

Not sure which part?

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