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 plumber. Here we give you complete expert guidance for this specific designer radiator — including details of any additional parts required — so you can ensure a smooth and successful installation when your tradesman arrives.

heat output

• Firstly, if you haven't already done so – use our heat calculator to work out your specific requirements for your room, ensuring you are selecting the correct size designer radiator in terms of the BTUs heat output it provides.

design & material

• DELFIN features double-layered bars: rear layer bar is flat, front bar has a distinctive C-shape.
• Designed to create a column-like appearance with a modern twist.
• Combines functional heating with a sculptural, contemporary look.
• Suitable for consistent styling across bathrooms, kitchens, and living areas.
• Made from high-quality steel profiles for durability and long-lasting performance.
• Additionally, we have created a thorough and detailed technical guide on central heating radiators, giving even more information and tips.

full range of sizes available

• In addition to the sizes we are displaying here on the heat is on, you can view the full range of 14 different sizes of DELFIN here on the Terma website.
• When viewing the Terma website, heat outputs are only listed in Watts – using the column header stating 75/65/20, multiply the amounts by 3.41 to get the BTUs equivalent.
• If you want to learn more about heat output, view our technical guide on heat output.
• We can process a special order for any size you wish to purchase if that size is not shown on our website.

colour & finish

• Painted in RAL 9016 Soft Matt White.
• Finished in a smooth, matt texture.
• Standard powder paint finish.
• Note: Soft means the paint has a double matt finish, where the matt properties are applied twice to achieve the deepest possible matt effect.
• Additionally, we have created a thorough and detailed technical guide on paint finishes and colours, giving even more information and tips.

installation & orientation

• Designed exclusively as a vertical (portrait) radiator and cannot be installed horizontally.
• Compatible with standard central heating systems.

advice on which valves to purchase for piped installation (central heating)

• This radiator is not supplied with valves, as we offer a vast selection of styles and colours. We do not include them because we cannot make this aesthetic choice on your behalf.
• Choosing the correct valves is easy with our guidance. Once a radiator has been chosen, valve selection can feel daunting — even plumbers rarely make the best aesthetic choice. As the homeowner, this decision is best made by you.
• On the right-hand side of this page we have pre-filtered our valve selection to show only the optimal valves for this specific model. You’ll see two sections:
  • 1. matching/complementary colour valve & pipe sets — either an exact match (painted using the same paint as the radiator) or the closest complementary match, depending on availability. These valves come complete with pipes and wall covers for a professional finish.
  • 2. standard valve & pipe sets — more economical standard valves which are not painted to match the radiator. Pipes and covers must be purchased separately.
• Which orientation of valves do I need: 3-axis (corner), straight or angled?
  • 1. Pipework through the wall — typically most modern pipework comes through the wall, and for this you'll need 3-axis corner valves. If your pipework is not yet in place, ask your plumber to bring it through the wall.
  • 2. Pipework through the floor — you'll need straight valves.
• Additionally, we have created a thorough and detailed technical guide on radiator valves, giving even more information and tips.

safety & compliance

• Fully built and tested to EN442 standards and UKCA certified.
• Heat outputs are independently verified by an external testing house to ensure accuracy.

guarantee & warranty

• Supplied with a 12-year manufacturer’s warranty for long-term reassurance.