February 18th, 2018
LPG and the Effects on Ratings
Why is the SAP rating so low when entering LPG? LPG (bulk and bottled) is much more expensive than mains gas, this has a dramatic effect on the SAP rating. The table below…
Energy & Sustainability.
February 17th, 2018
Home’s Heat Demand (kWh Year) for Heat Pumps
The Space Heating kWh per year figure in the “your home’s heat demand” section of the EPC gives different results for SAP default heat pumps and heat pumps selected from the product characteristics…
February 16th, 2018
FGHRS – FLUE Gas Heat Recovery System
A FGHRS is a system for recovering heat from flue gases that would otherwise be wasted. They are only applicable to mains gas, LPG and oil condensing boilers and must be selected from…
February 11th, 2018
CPSU and Thermal Stores
A CPSU or Combined Primary Storage Unit is a boiler with an integral thermal store. The thermal store must be greater that 70 litres, otherwise the system is simply a ‘storage combi’ and…
February 10th, 2018
RdSAP – A Potted History (1)
SAP was introduced for the first time in 1995, as the basis of a new approach to Building Regulations for new homes. It was subsequently updated in 1998, 2001, 2005, 2009 and 2012…
February 10th, 2018
Primary Energy Use vs Heat Demand in the Home
Question: Why does the current primary energy use multiplied by the total floor area not match the energy used in the home’s heat demand? Answer: the home’s heat demand, i.e. the space heating demand of…