Here at the heat is on, we put the knowledge of what you need directly in your hands as the homeowner, so you needn’t ask or wait for information from your electrician. Here we give you complete expert guidance for this specific heating element — so you can source all parts needed to ensure a smooth and successful installation of your electric / dual fuel towel rail or radiator when your tradesman arrives.
what is a heating element?
- A heating element is used as the heat source in an electric towel rail or radiator.
- It works by heating the water or oil inside the radiator, in the same way an element heats water inside a kettle.
- We have a full guide on heating elements if you want to learn even more — click here to read the dedicated guide.
temperature control & operation
- The Terma SS1 Smart Split Element Probe is designed to work in combination with the VEO range of controllers (sold separately) to create a fully functioning heating element.
- These probes are unique in that they offer outputs up to 2000 watts (2 kW), so are very powerful and can be used in high output radiators such as cast iron models.
- Timer options and functionality are provided by the specific VEO controller model this probe is paired with.
element specifics
- Probe lengths vary — see diagram and see further notes in the installation section below.
- Class 1 electrical rating.
wattage selection advice
- Choosing the correct wattage heating element is essential for effective and safe performance. It is even more important with an SS1 due to the high outputs of these probes. Don't overstate the power you need — ensure it is accurate for the chosen radiator.
- As a general rule, select an element with a wattage as close as possible to the radiator or towel rail’s central heating (hydronic) output measured in watts.
- If the heat output of your chosen radiator is listed in BTUs, you can convert this using the formula: BTUs ÷ 3.41 = Watts.
- Selecting a closely matched wattage helps ensure even heat distribution without overheating.
installation
- These element probes are safe to use both vertically and horizontally. A nodule on the neck of the probe guides correct positioning when used horizontally to ensure the internal heat sensor functions accurately.
- The high-wattage probes in this range (1500w, 1800w, 2000w) are extremely powerful and have very long probe lengths.
- Important note: the heating probe should not exceed 70% of the radiator’s length.
- Minimum radiator lengths required for high-wattage probes:
- 1500w probe (880mm length) → radiator must be at least 1257mm long
- 1800w probe (1015mm length) → radiator must be at least 1450mm long
- 2000w probe (1150mm length) → radiator must be at least 1642mm long
- Full installation instructions are provided in the accompanying manual, but here are some useful notes before fitting.
- Never switch on the element in open air — it must be submerged in the heating medium to operate safely. The element has a safety cut-out if it runs dry, so your tradesman should not test it by powering it on before installation.
electrification advice
- Before electrifying any towel rail or radiator, confirm that the chosen model is suitable for use with a heating element.
- Not all towel rails or radiators are compatible, as internal design and heat circulation affect performance.
- Installing a heating element in an unsuitable radiator may result in failure, which will not be the fault of the element.
dual fuel advice
- When using this element as part of a dual fuel setup (electric in summer, central heating in winter), the towel rail should be bled regularly.
- Air build-up inside the system can cause overheating or damage if the element runs without water circulation.
- The element should never be operated “dry,” as this can cause excessive surface temperatures and damage towels.
- Treat it as you would a kettle — never run it without water inside.
guarantee & replacement
- Backed by a 2-year manufacturer’s warranty for added reassurance and peace of mind.
- Usual lifespan of a heating element is 4 to 7 years depending on use.
- At end of life, you can simply replace this heating probe (SS1) part of the element while the separate controller can continue to be used, making it a cost-effective long-term solution.
