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Vaillant Thermostat 101819

Vaillant

Vaillant Thermostat 101819

Vaillant 101819 thermostat for Vantage and Unistor Vantage hot water cylinders.

At a glance

  • Also known as 1373436
Manufacturer part no.
101819
Showing prices

£69.41

£57.84 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 Vaillant 101819 is a thermostat used on Vaillant Vantage and Unistor Vantage hot water cylinders. It controls the cylinder's stored water temperature by switching the heat source on and off as the set point is reached. It is a serviceable component within the cylinder's control arrangement.

Signs this part needs replacing

  • Stored hot water runs hotter or cooler than the temperature set on the cylinder control
  • The cylinder overheats, or the high limit device trips repeatedly
  • Hot water temperature swings widely between draws
  • The boiler or heat source does not respond when the cylinder calls for heat
  • Adjusting the cylinder temperature setting has no effect on the water temperature

Before you order

  • Confirm the cylinder model and variant from the data plate on the appliance
  • Check the existing thermostat against part number 101819 before removal
  • Note the cylinder generation, as the Vantage and Unistor Vantage ranges span several build periods
  • Isolate the electrical supply and drain or depressurise the cylinder as required before fitting

Not sure which part?

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