If my logic is right this would achieve the same result as spending £450 on a more modern Grundfos Scala2 pump which is capable of “intelligent pump control” where it boosts its power level dependent on demand. I think I need to replace the lever valve (which is restricting the flow to a fixed amount which has to be shared equally by all the showers) with a pressure reduction valve (which would keep the downstream pressure constant, so if a second shower switched on it would automatically increase the flow rate to maintain downstream pressure). Avsak tlak vody v obecnom vodovode sa nezmenil, cerpadlo alo znie inak ako na zaciatku. Isiel som pozriet cerpadlo a to ukazuje chybovu ikonu 5, prilis velky tlak vody. Dnes doobeda som zrazu zistil ze ide slaby tlak vody. (in layman’s terms) if the pump has “power level” of 4, then if one shower is on I want it to have a power level of only 2, but if two showers are on then I want EACH of them to have a power level of 2, which should still be fine because the pump is capable of supplying 2+2=4. Mam cerpadlo Grundfos Scala2, ktore bezalo bez problemov takmer 2,5 roka. When two showers are on they are both fine, so no power drop in the first shower when the second one is switched on What I actually want is to have my cake and eat it i.e.: When two showers are on they are not powerful enough When two showers are on they are each fine When only one shower is on, it is too powerful The booster pump has a fixed non-adjustable power level and on the pump outlet pipe there is a lever valve. I have an unconventional domestic system where 3x upstairs bathrooms (including one in the loft) are fed by a loft cold water tank paired with a powerful Grundfos MQ3-35 booster pump, with hot water heated on demand using a Rinnai gas-fired continuous flow heater.
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