What length of gas hose is suitable for your appliance
Why the length of a gas hose is more important than it seems at first glance
When choosing a gas connection hose, most people focus primarily on the diameter, type of thread or material — for example, whether to choose a stainless steel or rubber hose, internal or external thread. The length of the hose is often considered a secondary parameter, which the customer only remembers when they are already standing with the appliance ready for connection and realize that the hose is either hopelessly short or, on the contrary, so long that it cannot be reasonably stored behind or under the appliance. From our experience with installation companies and daily inquiries at our support, we know that an incorrectly estimated length is one of the most common mistakes when replacing a gas stove, cooktop, flow heater or connecting a boiler to the gas supply.
The length of the gas hose is not just an aesthetic or practical matter — it directly affects the safety of the entire connection. A hose that is too short is installed under tension, which stresses the end fittings and over months or even years can lead to microscopic leaks at the threaded connections. A hose that is too long, on the other hand, must be stored somewhere, and if it is stored incorrectly — bent, twisted in a sharp arc, or even pinched when pushing the appliance against the wall — the same risk of mechanical damage arises, just from the opposite cause. This article will show you how to measure the length correctly, what lengths are commonly available and suitable for which appliances, and what to pay attention to during the installation itself, so that the hose reliably serves its purpose for its entire lifespan.
How to correctly measure the distance between the appliance and the gas valve
The basis for choosing the correct length is an accurate measurement of the actual distance between the gas outlet on the appliance and the shut-off valve on the gas line. Here it is important to point out one thing that many customers underestimate — the real route that the hose will follow is measured, not the air distance "as the crow flies". If the valve runs from the wall to the side and the appliance is standing perpendicular to the wall, the hose must make a bend, and this bend must be included in the measurement.
Step-by-step measurement procedure
The recommended procedure for measurement looks like this:
- Measure the distance from the gas valve outlet to the connection point on the appliance along the route that the hose will actually follow (not along a straight line in the air).
- Add a reserve for the natural bend of the hose — the hose should not be stretched "completely straight", but should have a slight sag that compensates for thermal expansion, vibrations and minor movements of the appliance during normal use.
- Consider whether the appliance will need to be occasionally pulled out (e.g., for cleaning behind the stove) — in such a case, it is necessary to allow sufficient extra length so that the appliance can be pulled out by at least 30–40 cm without straining the hose.
- Also take into account the height difference between the outlet on the appliance and the valve, if they are not at the same height — typically with stoves, where the valve is low on the floor and the connection on the back of the stove is higher.
Practical experience shows that it is advisable to add approximately 15–20% to the measured distance as a safety reserve. So if the measured route comes out to 60 cm, it is actually better to choose a hose with a length of 750 mm, not a hose exactly 600 mm long, which would have to be stretched completely straight.
Common measurement mistakes
Among the most common mistakes we encounter are measuring "by eye" without a measuring tape, measuring only the air distance without considering the route around the corner of the cabinet or behind the appliance, and forgetting the space needed for tightening the through nuts, which require access with hands and a wrench. We recommend measuring directly along the route the hose will follow using a measuring tape, including all detours around furniture, corners of the kitchen line or recesses.
Overview of available lengths and their typical use
In our category of gas connection hoses, you will find several standard lengths that cover most common installation situations in homes and businesses. These include lengths of 500 mm, 750 mm, 1000 mm, 1250 mm and 1500 mm, each of which has its typical application.
| Hose length | Typical use | Approximate distance of the appliance from the valve |
|---|---|---|
| 500 mm | Compact kitchens, cooktop close to the valve, small flow heaters | up to 35 cm |
| 750 mm | Standard gas stove near the wall with a nearby valve, standard kitchen setup | 40 - 55 cm |
| 1000 mm | Stove or cooktop slightly distant from the valve, valve located sideways from the appliance | 55 - 75 cm |
| 1250 mm | Boiler or appliance located further from the gas line, valve in an adjacent cabinet | 75 - 95 cm |
| 1500 mm | Larger distances, more complicated routes with detours around furniture, industrial and professional kitchens | 95 - 115 cm |
These values are approximate and it is always true that an accurate on-site measurement takes precedence over any table. Nevertheless, this overview will help you quickly orient yourself and decide which length is worth ordering for a specific type of installation, even before you go to the appliance with a measuring tape.
Specific practical scenarios — which length to choose according to the appliance
The following examples are based on common situations we encounter during installations and customer inquiries. They serve as a guide, not as a universal rule — it is always necessary to measure the specific location.
Gas stove in a kitchen line
This is the most common case. The stove is usually located in a row of kitchen cabinets and the valve is placed either directly behind it in the lower cabinet or in the adjacent cabinet 20–40 cm away. In practice, a hose with a length of 750 mm is most commonly used here, which provides sufficient reserve to allow the stove to be slightly pulled out for cleaning the floor or wall behind it, while at the same time the hose does not need to be complicatedly "hidden" in unnecessary bends. For stoves located in the corner of the kitchen or with a longer route through an adjacent cabinet, a length of 1000 mm to 1250 mm is recommended.
Standing gas stove
For gas stoves built directly into the worktop with a tap right underneath, a shorter hose is usually sufficient - 500 mm is often enough in many cases, since the distance between the outlet on the stove and the tap in the cabinet below is usually only a few tens of centimeters. It is especially important to ensure that the hose does not come into contact with sharp edges of the stove's metal cover or with electrical wiring in the same cabinet after installation.
Flow water heater (gas water heater)
With flow water heaters, it depends on whether the device is suspended directly above or next to the tap. If the distance is minimal, 500 - 750 mm is sufficient. If the heater is located further away from the original supply (typically during bathroom renovations, when the position of the heater is changed), it is more suitable to choose a length of 1000 mm or more to avoid stretching the hose between the wall and the device.
Central heating boiler
Gas boilers are usually connected directly to the riser or to a branch of the gas line running in close proximity to the boiler, so lengths of 500-750 mm are usually sufficient. An exception is installations where the boiler is moved to a different location during the renovation of the boiler room than it was originally - in such cases, longer hoses in the range of 1000-1500 mm are required, or even a modification of the supply with rigid piping, since the flexible connecting hose would serve only as a short end section, not as a replacement for a long section of pipe.
Movable and portable appliances
For portable stoves, terrace heaters or grilling devices connected to a pressure cylinder, the length is chosen depending on how far the appliance is from the cylinder. Longer variants (1250-1500 mm) are often chosen here, because the cylinder is kept at a distance from the burner for safety and practical reasons.
What happens if the hose is too short or too long
Choosing the wrong length is not just a matter of aesthetics or convenience when handling the appliance - it directly affects the safety and lifespan of the entire connection.
Risks of a too short hose
If the hose is too short, the installer or user may be tempted to move the appliance closer to the wall than its natural position or to stretch the hose into a straight line. This solution creates a permanent mechanical stress on both end fittings. In rubber and stainless steel hoses, this eventually leads to microscopic cracks in the sealing rings or to loosening of the threaded connection due to vibrations from the appliance (e.g., from a fan in the oven or from the normal operation of the boiler). A short, stretched hose is also much harder to visually inspect - its entire surface is not visible, as it is pressed tightly against the wall or the back of the appliance.
Risks of a too long hose
On the other hand, a hose that is too long must be hidden somewhere, and this is precisely the moment when the most frequent installation errors occur. The hose is bent into a loop with a too small radius of curvature, which exceeds the minimum bending radius specified by the manufacturer for both rubber and corrugated stainless steel hoses (typically around 5-8 times the diameter of the hose). The excess length can also end up in a space where it risks being crushed when the appliance is pushed against the wall, coming into contact with hot parts of the oven or chimney, or being mechanically damaged by sharp edges of metal covers.
Optimal condition - hose with a slight natural sag
The ideal condition is when the hose, after connecting both ends, creates a slight, smooth arc without sharp bends, with enough reserve to allow for minor movements of the appliance, but at the same time is not so long that the excess part lies freely in a space where it could be mechanically damaged. That is why it is worthwhile to have several lengths available to choose from - and not to settle for what is "approximately good enough".
Reserve for handling the appliance
For stoves, washing machines near gas lines or boilers that need to be occasionally pulled out from the wall during service, it is necessary to take into account that the hose must also handle this short-term pulling out without being stretched to the limit. When measuring, we recommend not only considering the static operating position of the appliance, but also how many centimeters the appliance will need to be occasionally moved - for example, for floor cleaning, chimney inspection at the boiler, or filter replacement. In practice, this means that we add an additional 20-30 cm to the basic measured distance for this purpose, which is another reason why it is worthwhile to choose a hose that is one step longer than would follow from a simple measurement in the resting position.
Relationship between length, diameter and type of thread
The length of the hose is not chosen in isolation - it is closely related to the diameter of the hose and the type of thread, which are described in more detail in the articles "Choosing the diameter of the gas hose according to the type of appliance" and "Internal thread vs external thread - differences and use". In general, longer hoses are commonly available in the same diameters as shorter ones (typically 1/2" for household appliances), so the length itself does not affect the diameter - it is important only that the diameter and type of thread (internal/external) match the connection on your specific appliance and on the tap. If you are unsure about the combination of threads, we recommend checking both ends according to the instructions in the article on internal and external threads before ordering the hose, so that you order the correct ending along with the length.
How to route the hose during installation - practical recommendations
Even with the correctly chosen length, the final installation can be inappropriate if the hose is routed incorrectly. During installation, follow a few basic rules:
- The hose must not run through sharp metal edges, furniture corners or places where it could be cut during normal movement of the appliance.
- The hose must not be routed in close proximity to heat sources - ovens, chimneys, exhausts - where it could be exposed to excessive temperatures exceeding the manufacturer's recommendation (typically up to 60-70 °C for rubber hoses).
- The minimum bending radius specified by the manufacturer must not be exceeded in the direction of a sharper bend - otherwise, kinking and restricted gas flow may occur, and in the worst case, the hose wall may even burst.
- The hose should not be routed in a place where it could be crushed by cabinet doors, sockets or when the appliance is pushed into its place.
- Excess length should not be hastily rolled into a coil, but should be stored in one smooth arc in a place where it will not be exposed to mechanical stress or heat.
How to proceed if you are unsure of the exact length
If you are not sure which length to choose, we recommend the following procedure, which is also used by experienced installers: first, stretch a regular string or tape exactly along the route the hose should follow, including all turns, and measure its length. Add the mentioned reserve of 15-20 % to this value and also add a reserve for handling of 20-30 cm, if occasional pulling of the appliance is expected. Compare the resulting number with the available lengths in our offer - 500 mm, 750 mm, 1000 mm, 1250 mm and 1500 mm - and choose the next higher value. It is always better to have a hose that is slightly longer with a natural curve, rather than a hose at the edge of its length, which is permanently under tension.
In case of doubts about the overall suitability of the connection, we also recommend reading the article "Installation of a gas supply hose step by step", which describes the entire procedure from checking the threads to verifying the tightness of the joint, and the article "How to check the tightness of a gas connection", which explains a simple way to verify tightness using a foaming spray or soapy solution after the installation is completed.
The impact of incorrect length on the long-term durability of the hose
Gas supply hoses, whether rubber or stainless steel, have a limited lifespan, which is discussed in more detail in the article "Lifespan and replacement of a gas hose - when is it time for service". Chronic mechanical stress caused by an incorrect length is one of the factors that significantly shorten this lifespan. A hose that is permanently stretched or sharply bent degrades faster than a hose stored in a free, natural curve - in the case of rubber hoses, this is manifested by earlier cracking of the surface material, while in the case of stainless steel corrugated hoses, it is material fatigue at the site of repeated bending. That is why it is worth investing a few extra minutes into precise measurement and choosing the right length, rather than dealing with premature hose replacement or, in the worst case, a gas leak in a few years.
Frequently asked questions about the length of gas hoses
Can I use a longer hose than necessary and simply coil up the excess?
This is not recommended. The hose must not be twisted into a tight loop with a small radius, as this exceeds the minimum allowed bending radius and there is a risk of kinking or restricting gas flow. If the hose is significantly longer than necessary, it is better to choose a shorter variant that corresponds to the actual route, rather than dealing with the storage of the excess length later.
Is it possible to connect two shorter hoses into one longer one?
No, gas supply hoses must not be connected or extended by using additional fittings on your own. Each additional connection is a potential leak point and such a solution does not meet the safety requirements for gas connections. It is always necessary to use a single, intact hose in a length corresponding to the actual distance.
What if none of the offered lengths fit exactly?
Choose the nearest available longer length and store the excess part in one smooth curve away from heat sources and sharp edges. It is always safer to have a hose that is slightly longer with a slight sag than a hose at the edge of its maximum tension.
Does the length of the hose affect gas flow or appliance performance?
At standard lengths used in households (500-1500 mm) and standard diameters for household appliances, the length of the hose has practically no measurable effect on pressure or gas flow. A more significant impact on flow has the correctly chosen diameter of the hose, which is discussed in the article "Which diameter of gas hose to choose according to the type of appliance."
Do I have to change the hose when replacing the stove, or can I use the original one?
If the original hose is in good technical condition, within the valid inspection period, and its length corresponds to the new connection point on the new appliance, it can theoretically be left in place. In practice, however, it is almost always recommended to replace the hose with a new one when replacing the appliance, because during the removal of the old hose it often gets bent or the seals are damaged, and the cost of a new hose is negligible compared to the price of the appliance.
How can I tell that the hose I have at home is too short?
A typical sign is that the hose runs almost in a straight line without any natural sag, or is visibly taut at both end fittings. If the appliance cannot be moved even slightly without the hose being pulled to its limit, it is a clear sign that the current length is insufficient and should be replaced with a longer one.
Summary
The correct length of a gas supply hose is the foundation of a safe and long-term reliable installation. The key is to accurately measure the actual route the hose will follow, add a reserve for a natural curve and for possible handling of the appliance, and choose a length that corresponds to this distance without unnecessary stretching or, on the other hand, excessive coiling. In our offer you will find lengths 500 mm, 750 mm, 1000 mm, 1250 mm and 1500 mm, which cover the vast majority of common domestic and professional installations. If you are unsure about any other parameter of the connection - diameter, type of thread, hose material or the installation procedure itself - we recommend reading other topics in this Knowledge Centre, which follow up on the choice of length and together form a complete guide to safely connecting a gas appliance.
Do you have a question about this topic?
Are you unsure or dealing with a specific situation in your home? Write to us - we are happy to help.