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Buy Filling Hose? | 1.5–5m Central Heating Sets
A filling hose is essential when refilling a central heating boiler or heating system. With the right filling hose, you ensure the system is filled safely, leak-free, and at the correct pressure.
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At EnergyBy, you will find high-quality filling hoses and filling hose sets in various lengths, suitable for both DIY homeowners and professional use.
Our filling hoses are easy to connect to the water tap and central heating system and are often supplied as a complete set including fittings and a radiator bleeding key.
A filling hose (also known as a boiler filling hose) is essential for adding water to your central heating boiler. We supply premium Bonfix filling hoses in lengths from 1.5 meters to 5.0 meters. All hoses feature standard 3/4 inch connections and are available directly from stock.
What Is a Filling Hose?
A filling hose is a flexible hose that connects your water supply to your central heating boiler to refill the heating system.
When the water pressure in your central heating system drops below 1.5 bar, you need to refill it with water. This can easily be done using a central heating filling hose.
Why Buy a Filling Hose from EnergyBy?
✔ Largest assortment – All lengths and brands in one place
✔ In stock – Ordered before 15:00, delivered the next day
✔ Suitable for almost all central heating boilers
✔ Competitive prices for A-brands
✔ Clear and detailed product information
✔ 14-day return policy – Not satisfied? Money back
Which Filling Hose Do I Need?
Choosing the right filling hose depends on:
- The distance between the water tap and the boiler
- The type of connection (usually 3/4″ female thread)
- The required length (for example 1.5 m, 3.5 m or 5.0 m)
For most household central heating systems, a 3.5 meter filling hose is sufficient.
If the boiler is located further away, a longer hose is more practical and safer than extending with extra fittings.
What Length Filling Hose Do I Need?
For most residential systems, a 3.5 meter filling hose is sufficient. If the boiler is located further away, a longer hose is safer and more convenient than using extensions.
Tip: Measure the distance between your water tap and boiler. Choose a filling hose that is approximately 50 cm longer than this distance for comfortable handling.
How to Choose the Right Filling Hose (And Avoid Mistakes)
Tips When Choosing a Filling Hose
✔ Always measure the distance between tap and boiler
✔ Choose slightly longer rather than too short
✔ Check if your connection is 3/4″ female thread
✔ Use a radiator bleeding key after refilling
Common Mistakes When Using a Filling Hose
- Choosing a hose that is too short
- Leaving the hose under pressure after use
- Not removing air from the system
- Not tightening connections properly (risk of leakage)
Filling Hose or Filling Hose Set?
A filling hose set is ideal if you want everything arranged properly at once. A typical set consists of:
- A flexible filling hose
- Two fittings
- A radiator bleeding key
This helps prevent air in the system and ensures your installation is filled correctly.
Suitable for Boilers and More
Our filling hoses are suitable for:
- Central heating boilers
- Heating installations
- Water heaters
- Closed water systems
Thanks to strong materials, they can withstand the pressure created during system refilling.
How to Connect a Filling Hose
- Check the pressure – If below 1.5 bar, refilling is needed
- Connect to the tap – Attach the filling hose to the cold water tap (3/4")
- Connect to the boiler – Attach the other end to the boiler filling inlet
- Fill slowly – Open the tap until pressure reaches 1.5–2.0 bar
- Bleed radiators – Use the bleeding key to remove air
Frequently Asked Questions (FAQ)
What is a filling hose?
A filling hose is a flexible hose used to add water to a central heating system to restore the correct system pressure.
What is the difference between a filling hose and a flexible hose?
A filling hose is used temporarily to refill a central heating system. A flexible hose is permanently connected to a water or heating system. Filling hoses are intended for occasional use, not permanent installation.
What length filling hose do I need?
Measure the distance between the water tap and the boiler. In most situations, a 3.5 meter filling hose is sufficient. For larger distances, choose a longer hose.
Does every filling hose fit my boiler?
Most central heating boilers use a 3/4″ connection. Always check your boiler and tap specifications to ensure compatibility.
What exactly is a 3/4″ connection?
A 3/4″ connection refers to the thread diameter (three-quarter inch). This is the standard size for most boilers and drain ball cock in the Netherlands and Europe. Always verify whether your connection is male or female thread.
Do I need a radiator bleeding key?
Yes. A radiator bleeding key allows you to remove air from the system, which is essential for proper heating performance.
What is the difference between a filling hose and a filling hose set?
They refer to the same base product. “Filling hose” is the official term, but many people search for “filling hose set.” We use both terms to ensure you can always find the right product.
Can I use any filling hose for my boiler?
Yes. Almost all central heating boilers (Vaillant, Remeha, Nefit, Intergas, Atag, Bosch) have a standard 3/4 inch filling inlet. Our filling hoses are universally compatible.
How often should I refill my boiler?
When the pressure drops below 1.5 bar, you need to refill the boiler. You can read the current pressure on the boiler’s pressure gauge. Proper water pressure ensures efficient heating system performance.
Can I reuse a filling hose multiple times?
Yes, provided the hose remains clean and undamaged. After use, store it dry and without pressure.
How long does a filling hose last?
A high-quality Bonfix filling hose typically lasts 10–15 years with normal use. Store it in a dry place and avoid tight bends to prevent kinking.
Can I use a filling hose for other purposes?
Filling hoses are designed specifically for central heating refilling and drinking water. Do not use them for chemicals, fuels, or other liquids.
How do I measure the correct filling hose length?
Measure the distance between the water tap and the boiler filling valve. Account for bends and ensure the hose is not under tension. In most homes, a 3.5 meter filling hose is sufficient.
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