How To Size Radiator’s For A Low Temperature Central Heating System

May 8, 2022

When it comes to central heating, sizing radiators correctly is crucial for efficient heating and comfort in your home. If you’re thinking about implementing a low temperature central heating system, then let’s dive into the essentials of accurately sizing your radiators. Firstly, it's important to understand how low temperature heating systems work, especially when paired with Air Source Heat Pumps (ASHP). These systems operate at lower temperatures, usually between 35°C and 55°C, which means the radiators need to be larger to effectively heat the space. The trick is to calculate the heat output required for each room based on its size, insulation quality, and usage. To start, measure the dimensions of the room. This includes length, width, and height. Once you have the cubic volume, factor in insulation levels. If your home is well-insulated, you won't need as much radiator output compared to a drafty space. A general rule of thumb is to aim for around 50-70 watts per square meter of radiator output, depending on insulation. Next, consider the type of radiator you want to use. Traditional column radiators tend to provide warmth more efficiently at lower temperatures compared to panel radiators. But hey, it’s all about personal preference and aesthetics too. Additionally, don’t forget to account for any thermal mass items in the room, like large furniture or tiled floors. They can absorb heat and impact how long it takes for the space to warm up. If you’re a DIYer or homeowner looking to tackle this project, remember that proper sizing will save you money in the long run by ensuring you're not overspending on heating. And for my fellow plumbers, don’t hesitate to offer your expertise on radiator sizing and system design—this could be a great value-add for your clients. Check out the full video above for a more in-depth guide, and let’s make sure we’re all delivering cozy, warm spaces for those chilly nights. Happy plumbing!