Ultracom 2 cxi boilers have a curved grey fascia: tap buttons on the left, mode in the middle, heating buttons on the right.
- The radiator + and − on the right set the heating flow. Leave the tap +/− if you only came to lower the heating.
- Press minus to lower the flow, or plus to raise it. Typical range is about 10°C up to the installer maximum; 50°C is the manual’s recommended setting.
- Stop around 55°C if the house still warms. If an outdoor sensor or Glow-worm intelligent control is fitted, the boiler may set the flow itself.
Look up your exact model on Boiler Manuals if the fascia does not match. Then return to the Glow-worm flow-temperature page or the Boiler Optimiser.