Delta T Conversion
A vital part of evaluating and looking to improve the efficiency of your home is having in mind how much energy is needed to heat your home and keep you toasty and warm. Step forward Delta ratings!
What is a Delta Rating?
A Delta rating is comprised of the fourth letter of the Greek alphabet, Delta, or Δ. This sign has multiple uses, however in the case of heating, it signifies change in temperature.
What is Delta T?
Delta T, or ∆T portrays an average in the water's temperature flowing around the central heating system and the actual room temperature. Being able to understand Delta T, and what it means for you when you purchase a new radiator or towel rail, can ensure that you are making the best choice for your heating requirements.
Delta T is very useful for you to understand a room’s requirements for heating, based on the existing system that is installed. If the actual room temperature is 18ºC and the mean water temperature inside the radiators is 60ºC, the Delta T or ∆T value is calculated as 60 ºC - 18 ºC = 42ºC.
EG.if your current home heating system requires delta t50 (Δt50) and you choose radiators based on delta t60 (Δt60°), then the heat output of your radiators will be too low and not effective for your home.
Most modern heating systems that are powered by modern condensing boiler, will usually operate at Delta 50 and this will be the specification assumed for most people who are looking to buy a radiator or heated towel rail. The below correction factors below are based at Delta T 50 º.