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Central Heating Sealed System Equipment
Sealed Heating Systems
Sealed systems are the most commonly used form of central heating in Europe. Easy to install and alleviate the need to fit feed and expansion tanks in a central heating system. Air and water are separated by a flexible diaphragm. When the system is cold the expansion vessel is nearly full of air or nitrogen, when hot, the water expelled from the system by expansion enters the vessel and compresses the air or nitrogen.
Expansion Vessels
Sizes up to and including 24 litres may be wall mounted using the Mounting Bracket shown below. The 35 and 50 litre sizes have fitted feet. Not for use with potable water. Kitemarked to BS 4814.
TECHNICAL SPECIFICATION: Maximum working pressure 3 bar. Maximum system temperature 99ºC. Threads 3/4" BSP male.
Part No.
Capacity Diameter Height
Unit Price  Qty
11350
8 litre 228 mm 295 mm
£16.12
11351
12 litre 298 mm 260 mm
£17.61
11352
18 litre 298 mm 365 mm
£18.12
11636
24 litre 328 mm 405 mm
£20.15
11637
35 litre 380 mm 402 mm
£36.24
11638
50 litre 380 mm 537 mm
£50.35
 
Pressure Reducing Valves
Suitable for use with combination boilers. Internal cartridge and filter can be serviced in situ.
Maximum inlet pressure 16 bar.
Preset 3 bar. Adjustable 1-6 bar.
Part No. Description Unit Price  Qty
11342 1/2" BSP F x F, with gauge 1-9 £22.02
    10+ £19.81
       
11343 3/4" BSP F x F, with gauge 1-9 £26.21
    10+ £23.59
       
11344 15 mm with gauge
 1-9 £21.35
    10+ £19.22
       
11345 22 mm with gauge 1-9 £22.80
    10+ £20.52
 
Shock Arrester

To prevent water hammer. Fit as close to the problem area as possible. Set at 3.0-3.5 bar. Maximum pressure 15 bar.
Vessel capacity = 0.16 litre.
Diameter = 86 mm.
Height =122 mm.
Connection = 1/2" BSPTM

WRAS approved
Part No. Description Unit Price  Qty
11355 Shock arrester, 1/2" BSP
 1-9 £11.05
    10+ £9.95
         
       
Sealed System Filling Kit
Contains all the essential components required for a sealed system installation.
Contents: filling loop, safety relief valve complete with gauge, connecting T-piece and vessel mounting bracket.
Part No. Description Unit Price  Qty
11354 Filling kit £33.73
       
       
       
       
Mounting Bracket
Suitable for expansion vessels up to 25 litres. Vessels larger than this should be floor mounted.
Part No. Description Unit Price  Qty
11353 Mounting bracket £2.86
       
 
Safety Relief Valves
Diaphragm type safety valves. A necessity for ensuring the safety of sealed systems, to avoid over pressure. Set at 3 bar (44 p.s.i.) pressure, (except 17107 at 2.5 bar).
Part No. Description Unit Price  Qty
11346 1/2" BSP Fx 1/2" BSP F, compact head 1-9 £2.68
    10+ £2.42
       
17107 1⁄2" BSP F x 1⁄2" BSP F, compact head, set at 2.5 bar £4.60
       
       
       
       
Part No. Description Unit Price  Qty
11347 1/2" BSP M x 1/2" BSP F, compact head 1-9 £3.85
    10+ £3.47
       
       
       
       
Part No. Description Unit Price  Qty
12346 1/2" BSP M x 1/2" BSP F, standard head £4.64
       
       
         
Part No. Description Unit Price  Qty
11348 1/2" BSP F x 1/2" BSP F with gauge £7.29
11349 1/2" BSP M x 1/2" BSP F with gauge £7.31
11639 3/4" BSP F x 3/4" BSP F with gauge £9.49
Aluminium Tundishes
For use where an air gap or air break is required in sealed or unvented systems.
Part No. Description Unit Price  Qty
12165 1/2" angle aluminium tundish with 3/4" outlet £8.60
12166 3/4" angle aluminium tundish with 3/4" outlet £9.10
       
 
Air Vents
Bottle
  Bottle air vents with check valve which allows removal of the vent for cleaning without draining down the system.
Approximate height, excluding thread :
P/N 7703 65 mm (2.1/2")
P/N 7704 82 mm (3.1/4")
Part No. Description Unit Price  Qty
7703 3/8" 1-24 £2.45
    25+ £2.20
       
7704 1/2" 1-24 £2.39
    25+ £2.15
 

Robocol

Designed for the removal of air in the system.

TECHNICAL SPECIFICATION:
Connection : 15mm comp
Max. Working Pressure 6 Bar
Max. Working Temperature 115°C
Part No. Description Unit Price  Qty

17842

15mm comp. air vent

£3.72
       
       
 

 
       
 
Filling Loops
Comprising a DZR double check valve connected to either a straight or tee brass isolating valve. P/N 15583 has a further isolating valve at the double check valve end. Each hose is fitted with a WRAS approved stop and double check valve. All ends are 15mm compression.

8148
Part No. Description Unit Price  Qty

8148

15 mm straight x 15 mm straight, metal braid

 1-24 £6.99
    25+ £5.59
         
         
         
 

   
       

8165
Part No. Description Unit Price  Qty

8165

15 mm straight x 15 mm tee, metal braid

1-24 £8.51
    25+ £6.80
 

   
       
 
 
 

15583 		       
       
       
Part No. Description Unit Price  Qty

15583

15 mm straight (with valve) x 15 mm straight, metal braid

 £8.98
       
       
       
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