WATER PRESSURE GUIDE
Cold Water Tank
Cold Water Tank
Roof Space
Roof Space
To ensure you ach i eve t he bes t pos s i b l e per f ormance f rom your chosen br a s swa re or shower i ng produc t , you need t o be ab l e t o i den t i f y your ex i s t i ng p l umb i ng s y s t em and t here f ore your wa t er pres sure . The f o l l owi ng i n f orma t i on prov i des a gener a l over v i ew on wa t er pres sures and a gu i de t o ensure you choose t he r i gh t produc t f or you and your home . I f you have ‘ LOW WATER PRESSURE ’ you shou l d t ake ca re t o choose a produc t t ha t i s su i t ab l e , o t herwi se you mi gh t f i nd t ha t t he f l ow r a t e i s poor . I t wi l l be d i f f i cu l t t o ach i eve a mi xed t emper a t ure . I f you have ‘HIGH WATER PRESSURE ’ you can choose any produc t wi t h t he s ame or l ower pres sure requ i remen t . As a gener a l gu i de on l y , when connec t i ng mu l t i p l e produc t s you shou l d wor k t o t he produc t wi t h t he h i ghes t pres sure r a t i ng . Throughou t our brochure we have h i gh l i gh t ed by each produc t , a s imp l e key ou t l i n i ng whe t her t he produc t i s l ow pres sure ( LP ) , med i um pres sure (MP ) or h i gh pres sure (HP ) a l ong wi t h s t a t i ng t he mi n imum pres sure requ i red t o ach i eve t he bes t resu l t . The f o l l owi ng d i ag r am exp l a i ns t he pres sure requ i red f or each l eve l .
Pump
Hot Water Cylinder
Hot Water Cylinder
1st Floor
1st Floor
Ground Floor
Ground Floor
PUMPED GRAVITY FED CYLINDER - VENTED SYSTEM Most commonl y found in older UK hous ing that has been moderni sed • Ho t and co l d pres sures a re t yp i ca l l y unba l anced ( depend i ng on t he co l d ma i ns pres sure and t he r a t i ng o f t he ho t wa t er pump ) • Co l d wa t er pres sure i s a s per i ncomi ng ma i ns • Ho t wa t er pres sure i s a s per t he pump r a t i ng • Th i s t ype o f s y s t em i s gener a l l y cons i dered a s h i gh pres sure
GRAV ITY FED CYL INDER - VENTED SYSTEM Most commonl y found in older UK hous ing • Ho t and co l d pres sures a re t yp i ca l l y unba l anced ( t he co l d wa t er pres sure i s h i gher t han t he ho t ) • Co l d wa t er pres sure i s a s per i ncomi ng ma i ns • Ho t wa t er pres sure ( head pres sure ) i s d i s t ance ‘ a ’ i n me t res d i v i ded by 10 . For examp l es i f ‘ a ’ i s 1 me t re t hen t he ho t wa t er pres sure i s approx ima t e l y 0 . 1 ba r • Th i s t ype o f s y s t em i s gener a l l y cons i dered a s l ow pres sure
P l ea se no t e a l l produc t s ma r ked LP and MP a re a l so su i t ab l e f or HP wa t er s y s t ems .
Roof Space
Roof Space
0.5 Bar
0.49 Bar
0.99 Bar
1 Bar
1.99 Bar 2 Bar
Pressure Reducing Valve (3 Bar)
Low Pressure
Medium Pressure
High Pressure
Extra High Pressure
2
1
Hot Water Cylinder (Pressurised)
1st Floor
1st Floor
Combination Boiler
Ground Floor
Ground Floor
PRESSUR I SED CYL INDER - UNVENTED SYSTEM Most commonl y referred to by the brand ‘Megaf lo’ • The cy l i nder ( s ) can be l oca t ed anywhere i n t he house . • Ho t and co l d pres sures a re t yp i ca l l y ba l anced ( t he ho t and co l d wa t er pres sures a re equa l ) • Ho t and co l d wa t er pres sure i s t yp i ca l l y 3 ba r ( a s shown ) , o t herwi se t he ho t and co l d pres sure wi l l be approx ima t e l y t he s ame a s t he i ncomi ng ma i ns co l d pres sure • Th i s t ype o f s y s t em i s gener a l l y cons i dered a s h i gh pres sure
COMB INATION BOI LER - UNVENTED SYSTEM Most commonl y found in newer UK houses • The ‘ comb i ’ bo i l er i s gener a l l y l oca t ed i n t he k i t chen • Ho t and co l d pres sures a re t yp i ca l l y a lmos t ba l anced ( t he co l d wa t er pres sure may be ma r g i na l l y h i gher t han t he ho t ) • Co l d wa t er pres sure i s a s per i ncomi ng ma i ns • Ho t wa t er pres sure i s a s per i ncomi ng ma i ns bu t gener a l l y reduced s l i gh t l y due t o pres sure reduc i ng va l ves , f i l t er s and f l ow l imi t er s • Th i s t ype o f s y s t em i s gener a l l y cons i dered a s med i um - h i gh pres sure
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