Correct bore sizing for a shower hose for a pumped water supply

AI Thread Summary
Correct bore sizing for shower hoses is crucial for optimal water flow, especially in pumped systems. There are conflicting opinions on whether to use larger 11mm hoses or smaller 8mm hoses, with some suggesting that larger hoses provide better flow rates. However, the actual performance can vary based on the specific shower head and system configuration. In this case, switching to a full bore 11mm hose resulted in reduced flow, prompting consideration of an 8mm hose for improved performance. Ultimately, the choice of hose size should align with the system type and desired flow characteristics.
reddwarf4ever
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Correct bore sizing for a shower hose for a pumped water supply
Please don’t laugh, this may sound a trivial question, but it is important. I have seen so many conflicting opinions, even from manufacturers. Some say, just use the biggest bore possible, others say use a small bore 8mm for a fully pumped system & a large bore 11mm for a gravity system. There must be a reason why different size bore hoses are manufactured.

I changed the shower hose yesterday, thinking it to be the same; although it did have a scale catcher fitted, which I discarded, to a full bore 11mm shower hose, but it appears the flow is now less, so should I change it to an 8mm bore to achieve the maximum flow rate.

Many thanks
 
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