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Witten by Bernard Morgan (Engineer) & Adam Apperley (Marketing). Published: February 22, 2024. Updated: March 15, 2024

Boiler Flow Temperature – What should it be set to?

What is Boiler Flow Temperature?

Boiler flow temperature is the warmth level at which your boiler heats water before it’s circulated in your home for heating and hot water use. It’s a critical factor in your heating system’s efficiency. It influences both comfort and energy consumption.

Adjusting your boiler’s flow temperature can reduce heating costs without compromising comfort. Ideal settings are between 60°C and 80°C, balancing efficiency with safety to prevent scalding and the growth of harmful bacteria.

Optimal Settings for Health and Efficiency

  • General Guidance: The sweet spot for most homes lies between 60°C and 70°C. This range ensures efficient heating without the risk of scalding.
  • Special Considerations: To avoid health risks, maintaining a specific flow temperature may be required in homes with vulnerable individuals.

Boiler flow temperature - Central heating.

Adjustments for Savings

  • New boiler: If your boiler is older, you could be wasting a lot of money on inefficient heating. A new boiler could be up to 98% efficient and save homeowners £100s a year on their energy bill.
  • Spring and Autumn: Lowering the flow temperature to 50°C – 55°C during these milder months can cut costs. Incoming cold water isn’t as cold, and the weather is warmer.
  • Winter: 60°C to 75°C is recommended for older homes. Modern, well-insulated homes function efficiently at lower temperatures.
  • TRVs: TRVs, or thermostatic radiator valves, allow you to control the heat in individual rooms. Building regulations now require them as they offer better room control. For example, bedrooms tend to be set lower than living rooms.
  • Smart Thermostats: Smart thermostats can also help you make savings. Although most won’t adjust boiler flow temperature, they almost all allow control away from home and fine-tuning daily schedules. This can allow you to ensure a ‘normal’ schedule doesn’t run if you aren’t home.

Adjusting Your Boiler’s Flow Temperature

The method varies by boiler type, involving dials or digital controls. Consult your manual for precise instructions, but here’s a general overview:

  • Boilers with Dials: Look for dials with radiator or tap icons for heating and hot water adjustments. They may only have numbers (e.g. 1 -8) so you may need to experiment with different settings.
  • Digital Displays: Modern boilers may feature digital displays and buttons for precise temperature settings.
Temperature control on a Vitodens 100-W - Boiler flow temperature | Boilerhut

Viessmann Vitodens 100-W Touchscreen – Boiler flow temperature setting.

What should I set my boiler to?

Setting your boiler to between 60°C and 80°C will generally ensure a warm and cosy home.

Properly setting your boiler flow temperature can reduce heating bills and increase efficiency. If you understand the settings, you can adjust them seasonally. This allows you to be comfortable and ensure you’re not overspending on heating bills.

Refer to your boiler’s manual for specific instructions to ensure you don’t break your boiler. Also, we suggest never changing settings on a Friday. It might seem odd, but if you break your boiler, you may not be able to get an engineer out until Monday. Can you wait that long?

Here are a couple of other guides that might help:

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