• Ultra-compact design central heating filter
  • Protects boiler from damaging effects of corrosion debris
  • Ideal where space is restricted with only 105mm clearance required
  • Ready to install and easy to fit
  • 22mm in-line slip socket connections
  • Can be installed directly below a boiler or horizontal/vertical pipework
  • Brass drain port for ease of cleaning and draining
  • 10 year manufacturer warranty
Ultra compact in design the TF1 Sigma Mini Filter offers powerful protection of your central heating system and boiler against the damaging effects caused by corrosion. The powerful premium grade neodymium magnet provides a highly efficient and consistent level of collection and robust filtration. One of the smallest footprints on the market the Sigma Mini can be installed in the smallest of places on both vertical and horizontal pipework including directly under your boiler with a clearance as little as 105mm ideally on the return flow to your boiler. Installation is also made easy with its 22mm slip socket compression connections and a brass drain point allows for simple servicing and cleaning without the need to disassemble the filter.

£4.99 Standard Delivery, or FREE on most orders over £99* (some exclusions apply)

£9.99 Next day delivery is available for orders places before 12 noon. Any orders placed for next day delivery after this time, will take 2 working days to be delivered.

Working/delivery days are Monday to Friday, deliveries will not normally be made Saturday or Sunday.

We offer a 30-day returns policy on on the majority of our items*, as long as the item is unused, undamaged and unopened**. We only ask that the postage is covered by yourself. 


* Please see our delivery page for further details on specific exceptions.

** Some products that are made to order or personalised cannot be returned.

***Exclusions apply for items shipped directly from our suppliers, and some big & bulky items may incur an additional charge. Please see our delivery page for full details. 

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Fernox TF1 Sigma Mini Compact High Performance Central Heating Filter

  • £55.89
  • (Delivery from £4.99 )
Item in Stock   |   Usually dispatched within 24 hours
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Free UK Delivery on most orders over £99
Delivery Rates & Information

Delivery Options

Standard Delivery: £4.99 - Free for all orders over £99.*
Next Day Delivery: £9.99 - Available for orders placed before 12:00 PM (Noon).

Important Delivery Notes

Next Day Delivery Cut-off: Orders placed after 12:00 PM (Noon) using Next Day Delivery will be delivered within two working days.
Working Days: Our standard delivery and shipping days are Monday through Friday. We do not normally deliver on Saturdays or Sundays.

Easy 30-Day Returns

We want you to be happy with your purchase! We offer a 30-day returns policy on all items, provided the following conditions are met:
  • The item is unused and undamaged.
  • The item is returned in its original packaging.
  • The customer is responsible for the return postage costs.

Combining Your Order

We always strive to combine your order into a single delivery. However, your order may arrive in multiple shipments if it contains:
  • Items from different warehouses (Standard items).
  • 'Direct' items (These are shipped separately and directly from the supplier) and will arrive separately from other items in your order.

*Exclusions & Additional Charges

The following items may be excluded from standard shipping rates or may incur extra delivery charges:
  • Items Shipped Directly from Suppliers ('Direct' items).
  • Certain Large or Bulky Items.
Want it by Tuesday 13th October? Order within 14 hours, 12 minutes