This new manual now incorporates the content of the previous GID5 manual covering water heaters. It provides guidance and technical illustrations on the installation, service and maintenance of: Central Heating Appliances - Wet of rated heat input not exceeding 70kW net, Central Heating Appliances - Dry of rated heat input not exceeding 70kW net, Water Heating Appliances - Gas fired instantaneous water heaters, storage water heaters (including pressurised types) to independent circulators of rated heat input not exceeding 70kW net.

Contents include: Introduction Central heating wet Open-flued and room-sealed boilers Combination boilers Combined gas fire/back boilers Combined gas fire/back circulators Warm air heating Warm air heater replacement Warm air systems – general installation details Water heaters General installation details