AHHHH!! Heat loss calculations… again!

Following OFTEC’s recent E-News article addressing heat loss requirements, it is evident that the advice, guidance, and overall complexity pose significant challenges for technicians installing liquid fuel appliances.

Heat loss calculation

A major obstacle faced by technicians is interpreting the requirements outlined in energy efficiency documents, such as Approved Document Part L (England) of the building regulations. These documents, while crucial, are not always straightforward, leading to confusion when striving for compliance. OFTEC aims to clarify that we do not create these requirements, instead, we merely convey and interpret them for technicians.

OFTEC Support:

OFTEC has taken steps towards helping simplify the calculation process. The receipt of a letter of intention from the Building Safety Regulator allowing the use of the simplified method for replacement-only boilers in England is a significant step, However, it’s important to note that the referenced document is still in the consultancy stage, and we actively seeking clarity for consistency. Technical notices 035 and 038 have been produced to help technicians, and OFTEC remains committed to collaborating within the industry to update and provide suitable tools and support for technicians. Emphasizing the importance of sizing and energy efficiency, OFTEC actively encourages good design practices.

OFTEC recommended tools and methods:

• Domestic Heating Design Guide (CIBSE)

• Heat Pump Calculator (MCS)

• Calculation software complying with BS EN 12831-1 and BS EN 12831-3

• Plumbing Engineering Services Design Guide (CIPHE)

• Guide B1 (CIBSE)

• FB 59 Design of Low-temperature Domestic Heating Systems (BRE) OFTEC acknowledges the challenges technicians face in heat loss calculations and is actively working on solutions. Through industry collaboration, training, and calculation tool accessibility. The goal is to improve clarity for compliance with energy-efficient system design.