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Hyco SF3 Speedflow Expansion Vessel & Check Valve

£64.80 £54.00
In stock
Delivery Time:
Next Working Day
1 Year
Quick Code:
Order Line:
01977 663331
  • 15mm single check valve
  • H225mm x D120mm 
  • Capacity 2ltr 
  • Stainless Steel construction

Hyco SF3 Speedflow Expansion Vessel & Check Valve.

The SF3 kit contains a 2 Litre Expansion vessel and check valve to prevent expanded hot water re-entering the cold water supply. The SF3 kit is suitable for use with small unvented water heaters such as the Hyco Speedflow units.

To be used in conjunction with Hyco Speedflow 5L, 10L and 15L unvented (mains pressure) water heaters if a one-way device is fitted that prevents hot water expansion or if there is a cold water off-take too close to the heater. 

  • High quality manufacture
  • Expansion vessel and check valve
  • 2 litre expansion vessel set at 3.5 bar
  • Built to last
  • For use with small unvented water heaters
  • 15mm single check valve
  • H225mm x D120mm
  • Compatible Models: Hyco Speedflow Water Heaters 
  • Capacity 2ltr 
  • Stainless Steel construction

This kit is required if either of the following conditions applies:

1. Presence of device preventing reverse flow
If a one-way device is fitted that prevents hot water expansion, the pressure relief valve would operate routinely on the heating cycle. This is not permissible under Water Regulations. Note that pressure reducing valves, water meters and similar devices are usually one-way and would block expansion.

2. Cold water off-take too close to the heater
It is a requirement to ensure that stored heated water does not mix with drinking water supplies. If there is a cold water off-take very close to the heater there is a risk that the hot and cold water supplies would mix. The minimum distance required between the heater and the nearest cold water off-take is 2.8m for the Speedflow 10L and 4.2m for the Speedflow 15L model.


Product Code Compatible Models EAN Number
SF3 Hyco Sppedflow Water Heaters 5060423370376


Product Information:

Capacity (Litres) 2
Mount Type On cold water inlet line
Pre Charge Bar Rating  3.5 bar
Brand Hyco 
Dimensions Expansion Vessel (mm) H225mm x W120mm x D120mm
Dimensions Check Valve (mm) H65mm x W25mm x D25
Weight (kg) 1.2

Our Delivery Charges and times are explained:


Delivery Charges
All deliveries have a standard charge of £7.99 + VAT up to 20kg. Where stated, certain products are delivered FREE of charge (mainland UK only*). Check the description of the desired product and if it says free delivery then you will not be charged for delivery*

Extra Charges
Where the weight is over 20kg we reserve the right to charge more dependent on product type and delivery postcode, our customer service team will be in touch and inform you of any extra charges before we despatch.

Delivery Times
All products will have a delivery time stated in their description. Next Working Day - these products will be delivered Next Working Day if ordered before 12.00, or in certain circumstances up until 4:00 pm. Please call if you require a Next Working Day and we will try our best to get it to you. Certain products will state within 48hrs, within 3 Days or within 5 days. These products will be delivered within the time stated. If you require delivery on a certain day please put this in the comments and we will aim to deliver on that day.

Certain products such as radiators are delivered after 5 working days, when purchasing a radiator please put in the desired delivery date which is 5 working days after ordering. In some cases, stock permitting, we can get radiators out sooner. Please call or put in the customer comments if you need something urgently and we will try our best.

Saturday Deliveries
We can arrange for a Saturday delivery for certain products, please call 01977 663331 for more details.

Please note: Although we will do our utmost to deliver your product in the time stated we cannot be held responsible for any unforeseen delays. Please do not book a plumber, electrician, etc until you have received the goods as we will not be held responsible for their time. Please read our terms and conditions for further details.

additional charges may be applicable dependent on your location please double-check with our customer service team

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