For a traditional cast iron radiator replacement, the Oswald Supply models are the clearest matches in this selection: they are described as cast iron, free-standing radiators for steam or hot-water heating. The 19-inch model suits buyers seeking a shorter unit, while the 25-inch models offer taller options in different tube and length configurations. The NRG radiators are column-style alternatives, but their listed construction is steel rather than cast iron. Check system type, dimensions, and heat requirements before choosing.
| Product | Best for | Key listed detail |
|---|---|---|
| Oswald Supply 19-inch, 4-tube radiator | Shorter replacement installations | 19-inch height; free-standing |
| NRG 300 x 1010 mm double-panel radiator | Buyers considering a wide, white column-style unit | Steel construction; listed BTU range of 1,836–2,320 |
| Oswald Supply 25-inch, 6-tube radiator | Taller units with a longer listed body | 25-inch height; 14-inch length |
| Oswald Supply 25-inch, 4-tube radiator | Taller units with a compact listed length | 25-inch height; 7-inch length |
| NRG 300 x 425 mm triple-panel radiator | Compact, dark-finish column-style heating | Steel construction; listed BTU range of 952–1,208 |
Oswald Supply 19-Inch 4-Tube Radiator
This Oswald Supply model is a true cast iron option in the supplied product list. It is described as a 19-inch-high, 4-tube radiator that can be used with steam or hot-water heating. Its listed depth is 4-7/16 inches and its listed length is 7 inches.
Best for: Buyers looking for a relatively short, free-standing cast iron radiator as a replacement option. The product description says multiple sizes are available, which may help shoppers compare configurations, but confirm the exact selected size before ordering.
The listing describes cast iron as providing quiet operation. This model is a reasonable place to start when the installation calls for a compact radiator and the existing heating system is compatible. Its stated steam and hot-water use makes it more relevant to traditional hydronic setups than the NRG steel alternatives.
Limitation: The listing does not provide a BTU output or detailed connection specifications in the supplied features. Confirm heat requirements, connection locations, and system compatibility with a qualified heating professional before purchase.
NRG 300 x 1010 mm White Double-Panel Radiator
This NRG radiator is a horizontal, white, double-panel column-style unit measuring 300 x 1010 mm, according to its listing. It is not identified as cast iron: the supplied features describe a modern finished radiator but do not specify cast iron construction. Treat it as a style alternative rather than a direct material match.
Best for: Buyers who prioritize a wide, low-profile white radiator and are open to a column-style design that is not listed as cast iron. The product description gives a BTU rating range of 1,836–2,320 and names bedrooms, bathrooms, and living rooms as possible household locations.
The listed design features include a smooth surface and a finish intended to complement different interior styles. Those details may matter when the radiator will be visible and the buyer wants a more contemporary presentation of traditional column styling.
Limitation: The product information does not establish that this unit is cast iron or confirm suitability for a US heating system. The dimensions and heat-output figures are supplied in metric and BTU terms; verify the installation and system requirements rather than assuming compatibility.
Oswald Supply 25-Inch 6-Tube Radiator
This Oswald Supply radiator is listed as a 25-inch-high, 6-tube cast iron model for steam or hot-water heating. Its listed depth is 6-15/16 inches and its length is 14 inches. It is described as free-standing, and the listing says multiple sizes are available.
Best for: Buyers comparing taller cast iron options who need the listed 14-inch length and 6-tube configuration. Compared with the 25-inch, 4-tube model below, this version has a longer stated body and a different tube count, so it may be the more relevant choice when those dimensions match an existing space.
The product description presents it as an efficient replacement option and says cast iron provides very quiet operation. These are listing claims, not a substitute for checking the heat loss of the room or confirming the radiator’s actual output for a particular system.
Limitation: No BTU output, connection details, or complete installation measurements are provided in the supplied features. Confirm those specifications, along with whether the radiator suits the building’s steam or hot-water setup, before making a replacement decision.
Oswald Supply 25-Inch 4-Tube Radiator
This model is a 25-inch-high cast iron radiator with four tubes. The listing describes it as suitable for steam or hot-water heating and gives a depth of 4-7/16 inches and length of 7 inches. It is also described as free-standing.
Best for: Buyers who want a taller cast iron radiator but have a compact listed length to work with. Compared with the 25-inch, 6-tube option, this model has fewer tubes and a shorter stated length. Choose it if those listed dimensions better fit the planned location, not simply because it appears smaller.
The description identifies it as an efficient replacement option and notes that cast iron provides quiet operation. Its material and stated heating-system uses make it a more direct match for a search for cast iron column radiators than either NRG product in this selection.
Limitation: The provided features do not state a heat-output rating or describe connection placement. Buyers should confirm output, plumbing connections, and clearances against the existing radiator and room-heating requirements.
NRG 300 x 425 mm Anthracite Triple-Panel Radiator
The NRG product is a 300 x 425 mm horizontal, triple-panel radiator with an anthracite powder-coated finish. Its listing identifies the material as mild steel, so it is a cast iron-style alternative rather than a radiator listed as cast iron. The stated BTU rating range is 952–1,208.
Best for: Buyers seeking a relatively compact, dark-finish column-style radiator and willing to consider steel construction. Its listed dimensions are smaller than those of the white NRG model, and its stated output range is also lower. Compare the heat requirement and available wall space before choosing between them.
The description says the radiator is designed for UK central-heating systems and conforms to BS EN442 standards. Those details are relevant to the product as listed, but US buyers should not assume they establish compatibility with a particular US installation.
Limitation: This is not described as cast iron, and the supplied features specifically say mild steel. Avoid it if the purchase requirement is confirmed cast iron construction or if the system needs a higher heat output than the listed range.
Buying Guide: How to Choose a Cast Iron Column Radiator
Do you need cast iron, or only a column-radiator appearance?
Start by deciding whether the material is essential. The Oswald Supply products are identified as cast iron. The NRG models are described as mild steel or as column-style radiators without a cast iron material claim. A steel radiator with a traditional column appearance may suit a style-focused search, but it is not an equivalent material choice. Read the product material description carefully before comparing designs.
Will the radiator work with your heating system?
Match the radiator to the system already installed. The Oswald Supply listings state that their models are for steam or hot-water heating. The NRG triple-panel listing refers to UK central heating. These descriptions do not establish that every model can connect to every US system. Ask a heating professional to check the system type, valves, connections, and operating requirements.
For a replacement, record the existing radiator’s connection position and the available pipework details. A radiator may have suitable height and length yet still require different connections. Do not assume that a product described for steam and hot water works in both configurations without installation-specific confirmation.
Which dimensions should you measure?
Measure the available space, including the height, length, and depth required for the unit. Also allow for the location of pipes and valves and any clearance required around the radiator. The supplied Oswald models list different heights, depths, lengths, and tube counts; compare each measurement with the actual installation rather than selecting by height alone.
The NRG dimensions are given in millimeters. For reference, 300 mm is about 11.8 inches, 425 mm is about 16.7 inches, and 1,010 mm is about 39.8 inches. Verify the seller’s full dimensional drawing before purchase, since the listed measurements may not describe every fitting or clearance needed.
How much heat output does the room require?
Use the room’s heating requirement as a starting point, not the radiator’s appearance. The NRG listings provide BTU ranges, while the supplied Oswald features do not provide BTU ratings. A missing output figure makes direct capacity comparisons difficult. Have the required output calculated for the room and ask the seller or installer for the radiator’s applicable output data.
Output can depend on system conditions and product configuration. Do not assume that a model with more tubes, a wider body, or a different panel count will provide the exact output your room needs unless the manufacturer’s specifications confirm it.
How should you compare tube count and panels?
The Oswald models are described by tube count, height, depth, and length. The NRG products are described as double- or triple-panel. These are different product descriptions, and the numbers should not be treated as directly interchangeable measures of heating capacity. Compare complete specifications, especially output, size, and system compatibility.
What should replacement buyers verify before ordering?
- Confirm whether the existing installation uses steam or hot water.
- Measure the radiator space and check its pipe and valve locations.
- Ask for the product’s heat output under conditions relevant to your system.
- Verify material if genuine cast iron is a requirement.
- Check that the product’s installation details are suitable for the home and location.
Frequently Asked Questions
Are all the radiators in this list made of cast iron?
No. The Oswald Supply models are listed as cast iron. The NRG triple-panel radiator is described as mild steel, and the white NRG model is not identified as cast iron in the supplied features. The NRG products are column-style alternatives, not confirmed cast iron models.
Can these radiators be used with steam heating?
The Oswald Supply listings state that their radiators are for steam or hot-water heating. Confirm the specific configuration, connections, and installation requirements before buying. The supplied NRG features do not describe the white model as a steam radiator, and the anthracite model is described for UK central heating.
Which Oswald Supply radiator has the shortest listed height?
The Oswald Supply 4-tube model is listed as 19 inches high. The other two Oswald models are listed as 25 inches high. Compare the listed depth and length as well as height when checking whether a radiator will fit.
Do the Oswald Supply listings include BTU output?
The supplied features do not state BTU output for the Oswald Supply models. Ask for the applicable output specification and compare it with the room’s heating requirement before choosing a replacement.
Are the NRG dimensions given in inches?
No. The NRG dimensions are listed in millimeters. The white model is 300 x 1010 mm, and the anthracite model is 300 x 425 mm. Confirm the manufacturer’s full measurements and required clearances before installation.