Zennor Black Dual Fuel Straight Heated Towel Rail 1800mm x 500mm – Thermostatic Bathroom Radiator
Product code: 19921
Material
Crafted from high-quality steel, this towel rail provides both strength and value. Steel is one of the most durable materials available, designed to withstand knocks, bangs, and the test of time—all while offering a wide range of finishes and styles to suit any bathroom.
Style
A straight ladder towel rail—this design features horizontal bars running flat between two vertical collectors. The flat profile makes it ideal for compact bathrooms, ensuring minimal projection from the wall while maintaining maximum functionality and towel-hanging space.
Colour
In a timeless matt black finish, this towel rail adds bold sophistication to your space. Black pairs effortlessly with nearly all interior styles, whether as a dramatic contrast to light walls or a subtle complement to darker tones. Its practical benefits include better concealment of dust, marks, and rust, keeping it looking newer for longer.
Heat Source
This is a dual fuel radiator, meaning it can operate via your central heating in winter or independently using electricity in warmer months. This year-round flexibility ensures you’ll always have warm, dry towels—no need to heat the entire home.
Accessories
Everything you need for wall mounting and dual fuel operation is included:
Wall brackets & masonry fixings
Chrome bleed valve and blanking plug
Thermostatic electric heating element
2 x T-pieces
1 pair of angled manual valves
The T-piece allows you to connect the electric element and valves simultaneously. The second T-piece (optional) is perfect for symmetrical setups. The element can be installed on either the left or right-hand side of the towel rail.
The Element – Talus Thermostatic Digital Element
Enjoy advanced control and convenience with this digital thermostatic element:
Temperature Control: Choose from 45°C to 65°C in 5°C increments, indicated via LED lights.
Standby Mode: Default mode when power is connected (blue LED).
Heating Mode: Activate by pressing the power button (red LED), then use the ‘T’ button to select temperature.
-
Boost/Program Modes:
Boost 2hr: Red LED on the clock button – runs for 2 hours, then returns to standby.
B1 Program: Blue LED – repeats the 2-hour boost every 24 hours.
B2 Program: Red LED – cycles 2 hours on, 10 hours off continuously.
Error Mode: Activates (flashing red lights) if fluid temperature drops below -10°C or exceeds 85°C.
Frost Protection: Automatically turns on if fluid temperature drops below 7°C.
Full installation instructions and a user guide are included.
Installation Notice
The electric element must be installed by a registered competent electrician. Incorrect installation will void the warranty. Fuse sizing is based on a standard UK 230V supply, but the final decision lies with the installing electrician depending on actual voltage conditions.
Need help calculating the heat output for your room?
Guarantee Length: 15 Years (Towel Rail), 2 Year (Element)
Collection: Zennor
Supplied with: Dual Fuel Element, T-Pieces, Manual Valves, Brackets & Included
Colour: Black
Finish: Matt
Heat Source: Dual Fuel
Ral Code: 9005
Material: Steel
Style: Straight Ladder
Radiator Valves Included: TRUE
Product Assurances: UKCA Marked, BSEN442 Certified,15 Years (Towel Rail), 2 Year (Element)
SKU ZEN-18500SB-THDF
Connection Size/Type: 1/2" BSP
GTIN:5056675429573
Tube Diameter: 22mm
Dry Mass (kg):12.8kg
Height: 1800mm
Width:500mm
Number of Tubes: 31
Pipe Centres: 350mm - 550mm
Projection: 91.5mm - 101.5mm
Wall to Pipe Centres: 76.5mm - 86.5mm
BTUs (T30): 1348.00
BTUs (T50): 2549.00
Watts (T30):395.00
Watts (T50): 747.00
Water Content (l): 7.4
Dual Fuel Heating Element Type: Multi-Function, Class 1 Insulated
Element Output: 600W
Maximum Operating Pressure (kPa): 800.00
Maximum Operating Temperature (C): 45°C - 65°C; 7°C Antifreeze Protection
Depth: 30mm
IP Rating: IPX4
Power Supply: 220V-240V Fused Spur, 5 Amp Fuse*
Operating Modes: Standby w/Antifreeze, Heating, Boost/Program, Error
Control Type: Built-In Programmable Thermostat
Download: Installation Instructions
- Free delivery (UK Mainland, Northern Ireland/Highlands/Islands)
- Once dispatched, all orders are sent on a Next Working Day delivery service
- We deliver between 8am and 6pm
- Contact us to delay delivery/request a specific day
- Limitless (that's right, no time limit!) returns
- Free of charge: either we will collect/send a returns label, or we'll refund your postage costs.
- Returns (for reasons other than damage or faults) can only be accepted if the item is returned in the original packaging and has not been fitted or used in any way.
- Whilst all our products pass strict quality standards, on very rare occasions, you may find an item arrives damaged. We ask that when you receive your order, you inspect the packaging before signing and note any damage when signing for it or refuse the delivery, with damage as the reason. Please contact us if you have any issues.
- If you find damage after you have signed for your delivery, please contact us with images of the damage as soon as possible.
- Once the damage has been reported, we'll either replace the item completely free of charge or refund you in full.
-
How can I contact you?
You can message us on live chat. We aim to reply in one minute, between 9am - 5:30pm. After 5:30pm, we'll create a ticket and get back to you asap.
-
Where do you deliver?
We deliver to the whole of the UK and Northern Ireland - including the highlands and islands.
We are currently unable to offer international delivery. However, you can place an order for collection and arrange to have a courier of your choice collect the order and delivery it to you.
-
Who will deliver my order?
Our 2 main couriers for UK Radiators products are DX Express and ArrowXL. Your courier will depend on the size and weight of the items on your order.
For example a pair of valves will be sent to you with Royal Mail, whereas a Column radiator will be sent with ArrowXL.
Tracking is provided for all orders dispatched from our warehouse.
If you order a Terma product, your item(s) will be coming directly from their warehouse.
The couriers they use are Stop Start and Parcelforce, and tracking is provided where possible.
-
Can I choose a specific time or day for my delivery?
If, for any reason, you would like to delay your delivery, please contact one of the customer service team as soon as you have placed your order, who will be able to assist you.
We are currently unable to request specific delivery time slots with our couriers.
Some of our couriers will advise you of a smaller time slot for your delivery, but unless otherwise stated, deliveries can take place any time between 7am and 7pm.
-
Can I upgrade my delivery?
Once dispatched, your order is sent on a next working day delivery service. This is the fastest available service, so we are unable to upgrade your delivery any further.
-
Can I send orders to a different address?
You can change the shipping address to a different address if your billing address matches what's registered against your payment method.
However, this can only be done when placing the order.
We are unable to change the delivery address after the order has been placed and dispatched. In this instance, the order would need to be cancelled and refunded, and a new order placed with the correct delivery address.
Your chosen heating system:
Watts & BTUs (British Thermal Units) Explained
What is a Watt?
Watts are our main unit of energy/power in the UK, commonly associated with lightbulbs and Home Energy performance certificates (EPCs).
What is a BTU?
BTUs are the unit of measurement used to portray a radiators heat output and a rooms heating requirement. 1 Watt is equal to 3.41 BTUs.
Why are they important?
We buy radiators to heat our homes, right? So, we need a way of knowing if a radiator is powerful enough to heat the room that we are shopping for - Watts and BTUs provide us with a value that makes its easier to compare radiators and ultimately choose the right one for our heating requirement.
Need help figuring out how much heat your room needs?
Our fast and easy-to-use BTU calculator can help you:
- Work out a heating requirement value (in BTUs & Watts) for your room
- Show you in-stock radiator recommendations that can fulfil this heat requirement
Delta (Δ) Ratings Explained
What is a Delta (Δ) Rating?
When discussing heat outputs, the Delta rating is the difference between the temperature of the water inside the heating system and the desired temperature of the room.
What does the value represent?
In simple terms, this value is about heat loss. Heating a room only works, if the radiator output exceeds the heat loss of the room.
We use this calculation to make it easy to choose a radiator that will have a heat output that exceeds the heat loss of the room when connected to your heating system type.
If you don't know the room heat loss, you can use our calculator to find out.
What Delta Rating should I use?
- Δ50 = Gas or oil boiler with a flow temperature of around 75°C and a return temperature of around 65°C.
- Δ30 = Low temperature systems e.g heat pumps.
Material
Crafted from high-quality steel, this towel rail provides both strength and value. Steel is one of the most durable materials available, designed to withstand knocks, bangs, and the test of time—all while offering a wide range of finishes and styles to suit any bathroom.
Style
A straight ladder towel rail—this design features horizontal bars running flat between two vertical collectors. The flat profile makes it ideal for compact bathrooms, ensuring minimal projection from the wall while maintaining maximum functionality and towel-hanging space.
Colour
In a timeless matt black finish, this towel rail adds bold sophistication to your space. Black pairs effortlessly with nearly all interior styles, whether as a dramatic contrast to light walls or a subtle complement to darker tones. Its practical benefits include better concealment of dust, marks, and rust, keeping it looking newer for longer.
Heat Source
This is a dual fuel radiator, meaning it can operate via your central heating in winter or independently using electricity in warmer months. This year-round flexibility ensures you’ll always have warm, dry towels—no need to heat the entire home.
Accessories
Everything you need for wall mounting and dual fuel operation is included:
Wall brackets & masonry fixings
Chrome bleed valve and blanking plug
Thermostatic electric heating element
2 x T-pieces
1 pair of angled manual valves
The T-piece allows you to connect the electric element and valves simultaneously. The second T-piece (optional) is perfect for symmetrical setups. The element can be installed on either the left or right-hand side of the towel rail.
The Element – Talus Thermostatic Digital Element
Enjoy advanced control and convenience with this digital thermostatic element:
Temperature Control: Choose from 45°C to 65°C in 5°C increments, indicated via LED lights.
Standby Mode: Default mode when power is connected (blue LED).
Heating Mode: Activate by pressing the power button (red LED), then use the ‘T’ button to select temperature.
-
Boost/Program Modes:
Boost 2hr: Red LED on the clock button – runs for 2 hours, then returns to standby.
B1 Program: Blue LED – repeats the 2-hour boost every 24 hours.
B2 Program: Red LED – cycles 2 hours on, 10 hours off continuously.
Error Mode: Activates (flashing red lights) if fluid temperature drops below -10°C or exceeds 85°C.
Frost Protection: Automatically turns on if fluid temperature drops below 7°C.
Full installation instructions and a user guide are included.
Installation Notice
The electric element must be installed by a registered competent electrician. Incorrect installation will void the warranty. Fuse sizing is based on a standard UK 230V supply, but the final decision lies with the installing electrician depending on actual voltage conditions.
Need help calculating the heat output for your room?
Guarantee Length: 15 Years (Towel Rail), 2 Year (Element)
Collection: Zennor
Supplied with: Dual Fuel Element, T-Pieces, Manual Valves, Brackets & Included
Colour: Black
Finish: Matt
Heat Source: Dual Fuel
Ral Code: 9005
Material: Steel
Style: Straight Ladder
Radiator Valves Included: TRUE
Product Assurances: UKCA Marked, BSEN442 Certified,15 Years (Towel Rail), 2 Year (Element)
SKU ZEN-18500SB-THDF
Connection Size/Type: 1/2" BSP
GTIN:5056675429573
Tube Diameter: 22mm
Dry Mass (kg):12.8kg
Height: 1800mm
Width:500mm
Number of Tubes: 31
Pipe Centres: 350mm - 550mm
Projection: 91.5mm - 101.5mm
Wall to Pipe Centres: 76.5mm - 86.5mm
BTUs (T30): 1348.00
BTUs (T50): 2549.00
Watts (T30):395.00
Watts (T50): 747.00
Water Content (l): 7.4
Dual Fuel Heating Element Type: Multi-Function, Class 1 Insulated
Element Output: 600W
Maximum Operating Pressure (kPa): 800.00
Maximum Operating Temperature (C): 45°C - 65°C; 7°C Antifreeze Protection
Depth: 30mm
IP Rating: IPX4
Power Supply: 220V-240V Fused Spur, 5 Amp Fuse*
Operating Modes: Standby w/Antifreeze, Heating, Boost/Program, Error
Control Type: Built-In Programmable Thermostat
Download: Installation Instructions
- Free delivery (UK Mainland, Northern Ireland/Highlands/Islands)
- Once dispatched, all orders are sent on a Next Working Day delivery service
- We deliver between 8am and 6pm
- Contact us to delay delivery/request a specific day
- Limitless (that's right, no time limit!) returns
- Free of charge: either we will collect/send a returns label, or we'll refund your postage costs.
- Returns (for reasons other than damage or faults) can only be accepted if the item is returned in the original packaging and has not been fitted or used in any way.
- Whilst all our products pass strict quality standards, on very rare occasions, you may find an item arrives damaged. We ask that when you receive your order, you inspect the packaging before signing and note any damage when signing for it or refuse the delivery, with damage as the reason. Please contact us if you have any issues.
- If you find damage after you have signed for your delivery, please contact us with images of the damage as soon as possible.
- Once the damage has been reported, we'll either replace the item completely free of charge or refund you in full.
-
How can I contact you?
You can message us on live chat. We aim to reply in one minute, between 9am - 5:30pm. After 5:30pm, we'll create a ticket and get back to you asap.
-
Where do you deliver?
We deliver to the whole of the UK and Northern Ireland - including the highlands and islands.
We are currently unable to offer international delivery. However, you can place an order for collection and arrange to have a courier of your choice collect the order and delivery it to you.
-
Who will deliver my order?
Our 2 main couriers for UK Radiators products are DX Express and ArrowXL. Your courier will depend on the size and weight of the items on your order.
For example a pair of valves will be sent to you with Royal Mail, whereas a Column radiator will be sent with ArrowXL.
Tracking is provided for all orders dispatched from our warehouse.
If you order a Terma product, your item(s) will be coming directly from their warehouse.
The couriers they use are Stop Start and Parcelforce, and tracking is provided where possible.
-
Can I choose a specific time or day for my delivery?
If, for any reason, you would like to delay your delivery, please contact one of the customer service team as soon as you have placed your order, who will be able to assist you.
We are currently unable to request specific delivery time slots with our couriers.
Some of our couriers will advise you of a smaller time slot for your delivery, but unless otherwise stated, deliveries can take place any time between 7am and 7pm.
-
Can I upgrade my delivery?
Once dispatched, your order is sent on a next working day delivery service. This is the fastest available service, so we are unable to upgrade your delivery any further.
-
Can I send orders to a different address?
You can change the shipping address to a different address if your billing address matches what's registered against your payment method.
However, this can only be done when placing the order.
We are unable to change the delivery address after the order has been placed and dispatched. In this instance, the order would need to be cancelled and refunded, and a new order placed with the correct delivery address.
