Radiator Capacity Calculator

Radiator Capacity Calculator, Guide to Calculating the Number of Pins on Toilet/Bathroom Radiators

We calculate the optimal radiator capacity by considering the area, purpose, and insulation status of the installation space. From cold bathrooms to offices, we determine the precise heat requirement (kcal/hr] tailored to the characteristics of the space and select the appropriate number of sections to maximize heating efficiency.

Radiator Capacity Calculation Formula

The size of the radiator is determined by calculating the heating load and dividing it by the 'standard heat output' for each product.

Calculation of required heating load (kcal/hr]
Required heat energy = Area (㎡] × Standard load per space (kcal/㎡·h] × Environmental factor

The standard load is applied at a value between 150 and 450 kcal/㎡·h depending on the use of the space and the insulation condition.

Calculate the number of required pins (sections].
Number of fins = Required heat ÷ Standard heat dissipation per fin

Generally, the heat dissipation per section of an aluminum radiator is calculated to be approximately 100 to 130 kcal/hr.


Detailed Guide to Calculator Input Items

Please check the items below for accurate capacity design.

1. Input space usage and area

Areas with high humidity or windows, such as bathrooms, experience significant heat loss, so it is important to select the right option for your intended use. Please enter the actual exclusive area requiring heating.

2. Insulation and environmental settings

If the wall insulation is poor or drafts enter through window gaps, you must set the environmental factor high to ensure sufficient capacity.

3. Determining the number of pins (sections]

Always round up the decimal point in the calculated pin count when making your selection. For example, if the result is 5.2, it is more stable to install the 6-pin product.


Recommended heating load standards by installation location

emplacement Load per area (kcal/㎡] Load per square meter (kW] Key Features
Standard room / Living room 300 ~ 600 0.5 ~ 0.8 For auxiliary heating purposes, low set temperature
Office / Commercial Space 600 ~ 900 1.0 ~ 1.2 Frequent opening of doors and comfortable heating required
Bathroom / Toilet 900 ~ 1200 1.5 ~ 2.0 Cold air from tiled walls, high heating load

Expert Practical Know-how & Checklist

These are practical on-site points that must be checked before installing the radiator.

  • Recommended for installation under the window

    It is recommended to install radiators under windows whenever possible. They are effective in balancing the indoor temperature by immediately warming the cold air coming from outside.

  • Piping air bleeding

    If heating is not even after installation, it is highly likely that air has accumulated inside. Removing the air through the air vent will restore thermal efficiency.

  • Energy saving through valve control

    You can efficiently save on boiler fuel costs by closing the radiator valves in unused spaces or setting the temperature low.


Frequently Asked Questions (FAQ]

  • Q. What is the difference between a radiator and a fan heater?
  • A. While fan heaters generate airflow and tend to dry out the air, radiators utilize radiant heat, offering the advantage of pleasant air and almost no noise.
  • Q. Is it better to have more pins (pages]?
  • A. The more fins there are, the larger the heat dissipation area becomes, making it warmer; however, this takes up more space and may result in a longer time for the hot water to circulate.
  • Q. Can it be installed in central heating buildings?
  • A. Yes, it can be installed by branching off from the existing heating pipes. However, you must select product specifications that match the building's allowable pressure (PN].