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Hot water draw off transfers hot water from the cylinder to all the
taps in the house
Open vent allows air to be released to the atmosphere to allow water
to fill into this part of the system
N.B. A gate valve is situated on the cold feed pipe to facilitate shutting off the hot water supply
N.B. A drain valve is located at the bottom of the feed pipe to allow the whole system to be drained
down
vent pipe
Water at the top of the cylinder will be warmer than the water at the bottom . This is known as stratification
feed pipe
hot water draw off
Building (Scotland) Regulations 2004
BS EN 806 Pt 1 -5 Specification for installation inside buildings conveying water for human consumption
Water Supply (Water fittings) Regulations 1999
Scottish Model Water Byelaws 2004
Feed pipe supplies water from the F & E cistern to the fill the indirect side of the system
Vent pipe allows air to be released from the system to the atmosphere to allow the water to fill in
Primary flow transfers hottest water from the top of the boiler to the top connection on the cylinder
Primary return transfers cooler water from the bottom connection on cylinder
back to the boiler to get reheated
SECTION THROUGH CYLINDER
Design considerations
1. Check type of cylinder and grade required
2. 450 mm horizontal draw off at top of cylinder to prevent parasitic circulation
3. Vent pipe sizing 150 mm + 40 mm for every meter of head continually rising to open end over cistern. Min pipe size is 22 mm
4. Cold feed always one size bigger in diameter in relation to the draw off
THE FOLLOWING SHOULD BE TAKEN INTO ACCOUNT
IN THE PLANNING OF HOT WATER INSTALLATIONS
A. Total consumption
B. Peak demands
C. Storage capacity
D. Method of heating water
E. Insulation of hot pipes and vessels
F. Use of a circulating system
G. Choice of materials for installation in relation to the nature of water
i.e. corrosive , hard or soft