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Spend £250 Or More & Get Free Delivery/Save 10% On Towel Rails *Discount Applied To Towel Rails Only* Spend £250 Or More & Get Free Delivery/Save 10% On Towel Rails *Discount Applied To Towel Rails Only*
Valves Not Included

Lazzarini Way - Onetube - White Designer Radiator - 1800 x 100mm

Ref: DRLWOTW1800100


Availability: In Stock

    ON ORDERS ABOVE £250.00

BTU Calculator

Radiator efficiency, is measured in British Thermal Units (BTU). The dimensions of a room are used to calculate the BTU output required to heat that room. Radiators all have a known and calculated BTU output. Using the BTU outputs in the Product Specification or description above, it is easy to calculate the size of radiator you need to help provide the total heat output necessary for your room.

How to calculate BTU requirement

The best way is to ask your plumber to perform the calculation for you. If you don't have access to a plumber, you can use the BTU Calculator below as a guide. Please note that the calculated figure relates to the combined heat output of all radiators in the room, therefore the towel rail or radiator that you purchase need not satisfy the entire BTU output if it is used to complement existing radiators.

This calculator is for guidance use only.

1. Please select your required units
Metric (metres) Imperial (feet)
2. Please enter room measurements
Height of room:
Width of room:
Length of room:
Window Area x²:
3. Please select type of room:
4. What is below the room?
5. What is above the room?
6. Please select type of outside walls:
7. Please select type of windows:
8. Please select number of outside walls:

Watt/BTU requirements:
Watts Required: 
BTU's Required: 

Essential Extras Available (will be displayed when product added to basket)


The Lazzarini Way Onetube 1800x100mm designer radiator is sure to add smart, contemporary style to any room in your home. Made from carbon steel to ensure great durability, this radiator features clean lines and a gloss white finish. The middle connection and tall, slim design of this radiator will help to save space.

Please note: valves not supplied.

Onetube Radiator Features:

  • Finish: gloss white (RAL9016)
  • Made from carbon steel
  • 1800mm x 100mm x 130mm
  • Bottom middle outlet
  • CE marked / EN442


Output (btu)1724
Guarantee2 Years
Output (watts)505
CE Marked / EN442Fully Certified
Installation TypeCentral Heating
Maximum System Temperature95 degrees
Maximum Pressure4 bar
Inlet Size1/2 inch
BTU at Delta T30679
Wattage at Delta T30199
BTU at Delta T501256
Wattage at Delta T50368
Dimensions (H x W x D)1800 x 100 x 130
Surface Finish Typeglossy
MaterialCarbon steel
Pipe centres (mm)50 (mm approx)
Projection From Wall (mm)140
Internal Volume (L) 16.5


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This product qualifies for the Buy Now Pay Later Finance

If you settled the outstanding balance before the first repayment is due then there will be no interest charges! The 'deferred period' is how long you have to settle the balance and not be charged any interest.

The available finance options for this product are :

Interest Free Credit 6 months

  • Cash Price £544.95
  • 0% Deposit £0.00
  • Loans Amount £544.95

  • 0% APR Representative
  • 6 monthly payments of £90.82
  • Total amount payable £544.92

Credit is subject to status and written quotations are available on request.
Credit is provided by Hitachi Capital Consumer Finance, a division of Hitachi Capital (UK) PLC, authorised and regulated by the Financial Conduct Authority.
Limitless Digital is trading as Big Bathroom Shop acting as a credit broker and are authorised and regulated by the Financial Conduct Authority.


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Here at we operate a 14 days return policy, so if you are not completely satisfied with your purchase(s) you'll be able to return it within 14 days of its delivery.

To speak with a member of our customer services team call 0345 122 7569 (dial +44 345 122 7569 for calls made from outside the UK).

Our hotline is open Monday to Thursday 8.30am to 9pm. Friday and Saturday 8.30am to 5pm. Sunday Closed. Full details of our returns policy can be found here.



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