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Baxi Hot Water Cartridge 12 Litre Flow Rate 720778401

Baxi

Baxi Hot Water Cartridge 12 Litre Flow Rate 720778401

Baxi domestic hot water cartridge, part 720778401, with a 12 litre flow rate, fitted to Baxi ErP Combi boilers to control DHW direction and flow.

At a glance

  • Part type: Diverter valves and hydraulics
  • Also known as 1119868, N2363
  • This part is fitted to a gas appliance; installation must be carried out by a Gas Safe registered engineer.
Manufacturer part no.
720778401
GC number
H90-610
Showing prices

£40.80

£34.00 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 Baxi domestic hot water cartridge, part number 720778401, is a flow regulator and directional control cartridge used in the domestic hot water circuit of Baxi ErP Combi boilers. It governs the direction and rate at which water moves through the appliance, with a rated flow rate of 12 litres. In some installations the cartridge also works as a check valve, preventing water from drifting into parts of the system where it does not belong.

Signs this part needs replacing

  • Hot water runs cold or the temperature fluctuates while a tap is open
  • The boiler does not switch cleanly between central heating and hot water
  • Hot water flow rate drops or becomes inconsistent
  • The heating circuit warms when only hot water is drawn, suggesting water is passing the wrong way
  • Scale, debris or wear is visible on the cartridge body when it is removed

Before you order

  • Check the appliance GC number and serial number against the compatibility list, as this cartridge is used across several ErP Combi variants.
  • Alternative part numbers 1119868 and N2363 may appear on older stock, labels or documentation.
  • Inspect the housing seals and O-rings while the cartridge is out and replace them if they are worn or hardened.
  • This part is fitted to a gas appliance; installation must be carried out by a Gas Safe registered engineer.

Not sure which part?

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