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Originally posted by pippin88
But its also about block design then.
Many blocks see no difference with different flow rates.
Take Cathars as an example. He has stated that there is hardly (>1ºC) difference when using a Eheim 1048 (600lph 1.5H) or a 1250 (1200lph ?H).
Yet he could design a block that uses large pumps effectively.
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I guess you're right, I've never tested that. But wouldn't that just mean it's "not really good at low flow" ?
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I'd prefer to use 1/2" tubing as it allows for a better range of components, and optimisations, in my opinion. Different pumps, blocks, etc. easily. [/b]
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It's more down to that really: I can get everything I need and want for 8mm tubing, and it fits my small case, so I'll use that. But if it's really hard to get 8mm stuff, but you can get everything for 12 mm, and when you want to use car heatercores with big barbs, it's just a lot more practical to use 12 mm. And it certainly gives your pump an easier life because of the lower pressures. It's senseless to make an Eheim 1250 try to pump its full capacity through 8mm tubes. It would suffocate it and make it noisy, and even break down on the long run.