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ThermoSphere Ultimate Heating Cable 75 LM
ThermoSphere Ultimate Heating Cable 75 LM

ThermoSphere Ultimate Heating Cable 75 LM

In stock

Description

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

Delivery Information

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): 11:00 am

NO Next Day Service - Scotland:

We are unable to offer next-day service to the following postcode regions in Scotland.

Postcode: AB, IV, KW, PA .

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 (Kerbside 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.

Returns Information
  • Please inspect your order upon receipt and contact us immediately (within 48 hours of receipt) if the item is defective, damaged, or if you receive the wrong item, so that we may evaluate the issue and make it right.
  • We will replace any items that are damaged during transit within 30 days of delivery.
  • We accept returns within 30 days of delivery.
  • Please note that customers are responsible for the cost of returning items where the return is due to a change of mind, including ordering the wrong item, ordering more than required, or any other non-fault reason
  • We will process returns and refunds promptly once the items are received at our warehouse.

Returning Trims

Schluter Trims:

  • Returning trims - 35% restocking fee applied.
  • Returning trim with replacement - 15% restocking fee applied.
  • Customers are responsible for arranging the return.
  • If we arrange a return collection, a £35 return item collection fee 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.

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.