What is a NHER rating?
National Energy Home Rating,
is the UK's largest energy rating scheme,
and rates the average energy consumption of
residential dwellings on a scale of 1.00 to
10.00 -- from poor to excellent.
The NHER rating
takes into account the local environment and
the effect it has on the building's energy
rating. The methodology evaluates the energy
usage and costs of:
- space heating
- water heating
- cooking, lights, & appliances
The NHER can only be calculated using
computer software as supplied by National
Energy Services (NES).
What is a SAP rating?
Assessment Procedure) is the UK official
assessment procedure for Energy Rating of
Dwellings, and is based on a scale of 1 to
100 -- from poor to excellent.
The SAP energy
cost rating is a simplified version of the
NHER model and is based on energy costs for
space and water heating only. It is thus
less accurate than a NHER rating.
compliance with SAP 2001 was demonstrated
through one of the 3 recognized methods by
the Building Regulations 2002: Elemental,
Target U-value, and Carbon Index methods.
2006, SAP 2005 is used for Part L1A 2006 compliance to calculate
whether the annual CO2 emissions
rate of the dwelling (DER) does not exceed the
target set by reference to a notional
building (TER). The Elemental, Target U-value, and
Carbon Index methods will not be applicable
Energy Performance Certificates
Complying with Building Regulations