Bartholomew 740mm Products
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Frequently Asked Questions
How does the 740mm height of the Bartholomew Cast Iron Radiator affect its heat output compared to the shorter 570mm model?
The 740mm height significantly increases the surface area available for heat transfer. Technically, each section of the 740mm model generates approximately 380 BTUs (111 Watts) at Delta T50, compared to around 293 BTUs for the shorter version. This increased output makes the 740mm model a superior choice for larger rooms or spaces with high ceilings where you need to generate substantial warmth without extending the radiator's width excessively.
Why is the Bartholomew 740mm technically described as a "Hospital Style" radiator and what is the maintenance advantage?
The Bartholomew 740mm features a wide, two-column profile with significant spacing between each section (approx 71.5mm section width). This design originates from Victorian hospitals where hygiene was paramount. Technically, the smooth casting and lack of ornate detailing allow for easy cleaning and unrestricted airflow between the columns. This prevents dust accumulation and makes it the ideal technical solution for allergy sufferers or sterile environments where maintaining high air quality is a priority.
What are the specific floor loading requirements for installing the heavy Bartholomew 740mm radiator?
The Bartholomew 740mm is a high-mass heating unit. Each individual section weighs approximately 9.7 kg. A typical 10-section assembly weighs roughly 97 kg empty, and over 115 kg when filled with water. You must technically verify that your subfloor can support this concentrated load. If installing on suspended timber floorboards, it is critical to position the feet directly over joists or install timber noggins (bracing) underneath to prevent the floor from bowing under the static weight.
Does the 174mm depth of the Bartholomew 740mm radiator require special consideration for hallway installation?
Yes, the 174mm depth is substantial. When planning your installation, you must account for the wall stay clearance (typically 20-30mm), bringing the total projection from the wall to nearly 200mm. In narrow hallways or corridors, this deep profile can technically infringe on the required clear passage width or obstruct door swings. You should measure the available floor space carefully to ensuring the radiator does not become a trip hazard or obstruction.
What specific type of wall stay is required to secure the top-heavy Bartholomew 740mm radiator?
Although the radiator stands on its own integral feet, the 740mm height raises the center of gravity, making it potentially unstable if knocked. A Luxury Wall Stay (solid brass or chrome arm) is technically mandatory. This component clamps firmly between the cast iron sections and anchors the top of the radiator to the wall. It provides the necessary lateral tensile strength to prevent the heavy unit from tipping forward, ensuring compliance with safety standards.
Why is the Bartholomew 740mm supplied in a "Primer" finish and what are the technical implications for the installer?
The standard finish is a Grey, Black, or White Primer, which is a transit coating designed only to prevent rust during storage. It is not a sealed finish. Technically, the installer or decorator must apply a final topcoat using an oil-based eggshell or specialist metal paint to seal the cast iron against moisture and oxidation. Failure to apply this topcoat will eventually lead to surface rust, especially in damp environments like bathrooms. Alternatively, factory-painted finishes are available.
Are the 1/2 inch BSP connections on the Bartholomew 740mm compatible with modern thermostatic valves?
The Bartholomew 740mm is cast with standard 1/2 inch BSP female tappings at the bottom. This ensures full technical compatibility with all standard UK radiator valves, including modern Thermostatic Radiator Valves (TRVs). You do not need reducers. However, due to the large scale and weight of the 740mm sections, it is aesthetically and mechanically preferable to use "traditional" style heavy-pattern valves that visually balance the radiator and provide a robust connection point.
Why is a system flush technically critical before commissioning the Bartholomew 740mm radiator?
Cast iron radiators are manufactured using sand-casting techniques. Microscopic residues of casting sand or metal filings can sometimes remain inside the waterways. Technically, it is vital to thoroughly flush the radiator and the entire heating circuit before final use. If this debris is not removed, it can circulate into the boiler, potentially damaging the pump or heat exchanger. Installing a magnetic system filter is highly recommended to trap any ferrous debris and protect the boiler warranty.
How does the thermal mass of the Bartholomew 740mm radiator influence the heating schedule of the property?
The Bartholomew 740mm has a very high thermal mass (high water content and iron density). This results in a slow heat-up and cool-down cycle (high thermal lag). Technically, you should adjust your heating timer to turn on 45-60 minutes before the room is needed. Conversely, the radiator will continue to emit useful radiant heat for over an hour after the boiler switches off. This "flywheel effect" provides a very stable, comfortable temperature, ideal for living rooms where consistent warmth is preferred over rapid fluctuations.