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ThermoSphere

ThermoSphere Ultimate Heating Cable 61 LM

In Stock Next Day Delivery | Order Before 12 PM | Subject to Stock Availability

£220.00
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Next working day delivery Order before 12pm .subject to stock availability
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Next working day delivery - stocked items only Order before 12pm .subject to stock availability
Trade account pricing available Apply online for exclusive contractor & developer rates
Rated excellent on Reviews.io Trusted by homeowners and trade professionals alike
Expert technical support Speak to a product specialist before you buy.
Type Heating Cable
Brand ThermoSphere
Length 61 LM
Model HDMC

ThermoSphere Ultimate Underfloor Electric Heating Cable

The first electric underfloor heating cable with guaranteed reliability.

Experience the next generation of electric underfloor heating with the ThermoSphere Ultimate® Heating Cable — engineered for maximum reliability, quick installation, and exceptional performance. Featuring innovative TwistedTwin technology and in-line joint construction, ThermoSphere Ultimate eliminates common installation risks by removing the need to cut into the subfloor or membrane. This results in a faster, safer, and more durable installation.

Key Features & Benefits

  • Guaranteed Reliability: The first electric heating cable designed with in-line joint technology, removing weak points for long-term dependability.
  • Fast & Easy Installation: No need to cut into the floor to accommodate bulky joints — saving time and reducing the risk of damage.
  • Universal Compatibility: Works perfectly with all popular heating and decoupling membrane mats, allowing you to use your preferred brand with confidence.
  • Flexible Output Options: Choose between 130W/m² or 195W/m² heat outputs to suit your specific project requirements.
  • Decoupling Protection: When paired with ThermoSphere Membrane, the system neutralises lateral floor movement and minimises the risk of tile cracking or delamination.
  • Waterproof Flooring Solution: When combined with approved waterproofing products, the system provides a fully waterproof layer — ideal for bathrooms and wet rooms.
  • Simple Installation Options:
    • Fleece-backed Membrane: Adheres easily with flexible tile adhesive.
    • Self-adhesive Membrane: Installs directly onto clean plywood subfloors.

Technical Specifications

Voltage 230V
Power Output 130W/m² or 195W/m²
Membrane Thickness 5.5mm
Cable Length Range 12m – 200m
Protection Rating IP68
Membrane Material Polyethylene
Cable Insulation FEP and HR-PVC
Robinson Test Rating Extra Heavy Use
Recommended Max Temperature 27°C (limited by thermostat controls)
Warranty Lifetime
Country of Origin (Cable) India
Country of Origin (Membrane) Italy

Cable Sizes and Outputs

Code Length (m) Area (m²) @130W/m² Area (m²) @195W/m² Output (W) Resistance (Ω)
HDMC-012-0150J121.150.77150352.67
HDMC-018-0225J181.731.15225235.11
HDMC-025-0300J252.311.54300176.33
HDMC-031-0375J312.881.92375141.07
HDMC-037-0450J373.462.31450117.56
HDMC-042-525J423.902.60525100.76
HDMC-050-0600J504.623.0860088.17
HDMC-055-675J555.103.4067578.37
HDMC-061-0750J615.773.8575070.53
HDMC-075-0900J756.924.6290058.78
HDMC-090-1080J908.324.99108048.98
HDMC-100-1200J1009.236.15120044.08
HDMC-125-1500J12511.547.69150035.27
HDMC-150-1800J15013.859.23180029.39
HDMC-175-2100J17516.1710.78210025.19
HDMC-200-2400J20018.4612.31240022.04

Why Choose ThermoSphere Ultimate?

The ThermoSphere Ultimate® cable redefines underfloor heating reliability. Its TwistedTwin design reduces electromagnetic emissions while increasing flexibility and durability. The in-line cold-to-hot joint ensures a seamless, low-profile installation — making it ideal for both new builds and renovation projects.

With a lifetime warranty and proven extra heavy use rating, ThermoSphere Ultimate is built to deliver consistent warmth and comfort for decades. Whether you’re installing in a bathroom, kitchen, or entire living space, it provides the perfect balance of efficiency, safety, and performance.

FAQs

Can ThermoSphere Ultimate be used with any decoupling membrane?

Yes. ThermoSphere Ultimate is compatible with all leading heating and decoupling membrane systems, giving you full flexibility with your preferred brand.

Is it suitable for wet rooms and bathrooms?

Absolutely. When used with waterproofing products, ThermoSphere Ultimate creates a waterproof layer, making it ideal for wet environments.

What makes the in-line joint design better?

Unlike traditional cables, ThermoSphere Ultimate’s in-line joint eliminates the need to cut into the subfloor to fit a bulky hot/cold joint, simplifying installation and reducing failure risk.

How long is the warranty?

ThermoSphere Ultimate comes with a lifetime warranty, ensuring complete peace of mind.

Delivery & Returns

UK Mainland & Scottish Highlands only

We do not deliver to Islands, Ireland or Northern Ireland

How is shipping calculated?

Shipping is based on your order weight and delivery location. Add items to your cart and enter your postcode to see the exact cost before checkout.

Some products supplied directly from our manufacturers (non-stocked brands) carry a separate delivery charge — this is shown clearly at checkout.

Free delivery on orders £450+ inc VAT

Tiles & tiling materials only · Free samples always ship free

Next working day delivery

Order before 12:00 pm · From £6.50 + VAT · APC Overnight or DPD · Under 50 kg

Not available weekends or bank holidays

Next-day delivery is not guaranteed. Delays may occur due to carrier issues outside our control. The next-day delivery charge is non-refundable in the event of a carrier delay.

No next-day to Scotland postcodes

AB · IV · KW · PA — please allow additional working days for these regions

Pallet delivery — orders over 50 kg

Semi, half or full pallet · Palletways or K & R Mason · Next working day

Kerbside delivery only — driver cannot bring goods onto the property

Supplier direct delivery (non-stocked products)

Some brands are shipped directly from the manufacturer and carry a separate delivery charge, shown at checkout.

Genesis (trims) — £19 + VAT · 1–3 days · cut-off 11:00 am

Marmox (mosaics, shower trays) — £15 + VAT · 1–3 days

Marmox (oversized backing boards) — £65 + VAT · 1–3 days

Schluter (trims) — £20 + VAT · 1–3 days

Bihui (trims) — £15 + VAT · 1–3 days

Free sample delivery

No minimum spend · Up to 4 free samples · Next working day

Free Click & Collect

Select Click & Collect at checkout to pick up your order from our Croydon warehouse. We'll send an email confirmation once it's ready — please wait for this before visiting.

Bring your order confirmation email or order number when collecting.

If someone is collecting on your behalf, they must have the order number and the name on the order.

Mon – Fri, 8:30 am – 4:30 pm. Closed weekends & bank holidays.

Tile Experience, 108 Beddington Lane, Croydon, London, CR0 4YY

Order tracking

Email or SMS sent by the carrier once your order is dispatched

Important: Do not book a tiler or fitter until your order has arrived and been fully checked. We cannot be held responsible for unforeseen delivery delays.
Full delivery policy 0208 689 4187

Delivery Costs:

Delivery fees are calculated based on the weight of your order and your delivery location. You can use the delivery fee calculator in your basket or on the checkout page to find the exact cost.


Delivery Area:

We currently only deliver to UK Mainland and the Highlands. We do not deliver to the Islands, Ireland, or Northern Ireland.


Next Working Day Delivery (Subject to Stock Availability):

Orders placed before 12:00 pm (noon) will be delivered the next working day, excluding weekends and holidays. This service starts from £6.50 (including VAT) and the final cost is based on the weight of your order and your delivery location. You can check the exact cost in your shopping cart or on the checkout page by entering your postcode.


Cut-off Time for Genesis Products (Non-Stocked): 11:00am


Economy Service (2-3 Working Days):

This service is only available for orders over 50kg. There is no additional charge for this service.


Sample Orders:

All sample orders are shipped for free via Royal Mail Tracked 48 or 24 service. Delivery typically takes 1-3 working days.


Delivery Methods:

Non-sample orders under 50kg will be dispatched via DPD or APC Overnight. Non-sample orders over 50kg (quarter, half, and full pallets) will be dispatched via Palletways or Kandrmason (curbside delivery only).


ORDER ONLINE & COLLECT IN-STORE!

Simply place your order online and choose the Click & Collect option at checkout.
We'll email you once your order is ready for pickup at your chosen store.
Collection hours: Monday - Friday: 8:30 am to 4:30 pm


For more information, please visit our Delivery Information page.

- Please inspect your order for any damages upon delivery and notify us immediately if you find any.

- We will replace any items that are damaged during transit.

- We accept returns within 30 days of delivery.

- Please note that customers are responsible for the cost of returning items.

- We will process returns and refunds promptly once the items are received at our warehouse.


Returning Trims
Schluter Trime
Returning trims - 35% restocking fees applied.
Returnign trim with replacement - 15% restocking fees applied
Customers are responsible to arrange returning the item.
If we arrange a return colleciton, a £35 return item collection feed will be applied.


Mapei-Profilpas Trims
A 20% restocking fee will be applied. (Item must be in re-sellable condition)
The customer is responsible for returning the item.


For more information, please visit our Return & Exchange page.

30-day return window

Returns accepted within 30 days of delivery. You also have a statutory 14-day cancellation right from the date of receipt.

Items must be unused & in original packaging

Returned goods must be uninstalled, unaltered and in the same condition as received.

Installed or cut items cannot be returned

Once tiles or materials have been cut, altered or installed, no return or refund is possible under any circumstances.

How to start a return

Contact us first at info@tileexperience.co.uk or call 0208 689 4187. Send the item back with your name and order number. Return shipping is the customer's responsibility.

Refund to original payment method

Processed within 3–5 working days of us receiving and approving your return.

Original delivery charges are not refunded. If no refund after 15 business days, contact us.

Damaged or incorrect items

Report within 48 hours of receipt. Email info@tileexperience.co.uk with your order number and photos of the damage. Confirmed replacements are sent next working day at no charge.

Non-stocked brands — restocking fee may apply

Returns for Genesis, Marmox and Bihui carry up to a 20% restocking fee. Schluter trims: 35% standard return, 15% if returning with a replacement order.

Cancellations

Cancel before dispatch for a full refund including delivery. Cancel after dispatch by rejecting the delivery — refund for goods only, not the delivery charge.

Important: Do not book a tiler or fitter until your order has arrived and been fully checked. Installed tiles cannot be returned.
Full returns policy 0208 689 4187

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