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Navien Bypass Adaptor 20036044A

Navien

Navien Bypass Adaptor 20036044A

Bypass adaptor for Navien NCB-CE system boilers, used to connect the bypass circuit within the appliance.

At a glance

  • Part type: bypass adaptor
Manufacturer part no.
20036044A
Showing prices

£10.21

£8.51 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 bypass adaptor is a Navien component used on NCB-CE System Boiler ERP appliances. It forms the connection point for the bypass circuit within the boiler, allowing flow to be maintained through the heat exchanger under varying system conditions. It is supplied as a single adaptor.

Signs this part needs replacing

  • Visible weeping or water staining around the adaptor body or its joints
  • Corrosion or scale build-up on the adaptor
  • Debris or sludge restricting flow through the bypass connection
  • Boiler noise or poor circulation linked to the bypass circuit
  • Damage to the adaptor threads or sealing faces during servicing

Before you order

  • Confirm the appliance model against the fitment list above
  • Check the existing part number on the component matches 20036044A
  • Isolate and drain the appliance before removal and fitting
  • Inspect the surrounding pipework and seals for condition before reassembly

Not sure which part?

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