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Just bought a new Grohe kitchen mixer tap and the following is in the manual...
"This Grohe fitting can be used in conjunction with a pressurised storage heater or an instantaneous heater".
"Operation with unpressurised storage heaters (=open water heaters) is not possible".
Now we have a 20 year old 'normal' boiler, with a hot water tank in the airing cupboard. Is that classed as an "open water heater"?
I know that is probably very simple but so am I!!
Thanks
I think they mean small heater units that just do the hot water for that one tap.
You dont find them that often (domestically)
You have a normal vented hot water system. Should have no problems.
A vented, oversink, storage heater:
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http://aquahot.co.uk/index.php?action=store&id_prd=2140
No it means high pressure.
Will probably not work with a low pressure system fed from a tank in the roof
That's exactly the problem - the tap has some internal paperwork that is quite narrow bore - circa 10mm from memory.
They have a minimum working pressure of approx 3bar - if your cold water tank is in the loft of a 2 storey property, the pressure at the kitchen mixer will be in the region of 0.5 - 0.7 bar.
Three choices (in order of cost)
Swap the tap for one with a lower working pressure
Fit a hot & cold water pump to feed it - a shower pump would do the trick
Upgrade the whole house to an unvented hot water system.
Stoner is wrong it needs pressure to work and what smudger said
Thanks all - back to the shop with that one then!