Specification for installation of gas-fired hot water boilers of rated inputs of between 70kW (net) and 1.8 MW (net) (2nd and 3rd family gases)BS 6644 is a key standard on installation of gas fired hot water boilers. It specifies requirements for the installation, including design, inspection and commissioning, of gas fired hot water boilers of net rated heat inputs exceeding 70 kW. Groups of boilers with individual net heat inputs of 70 kW or less, but with total net heat inputs in excess of 70 kW are also covered by this standard. This standard applies to the installation of boilers that

Manufacturers of construction products and building elements

Annex A (informative) Results of trials to verify the range performance of the AISSART

surface finish and accuracy of various features are specified

natural hazards and intentional disruption

With BS EN 1301-1

Strategic objectives

initial and main backfill

providing a classification system for specific covered electrodes

Cycle times

NOTE The term “optical” is used to describe that part of the electromagnetic spectrum produced by the transmitter to which the receiver is responsive

The relevant specification defines:

which are not to be found in BS 8900