Quote Originally Posted by MrToad View Post
First and foremost thank you for yet another very interesting and informative thread.

It looks like we've got another potential contender in our hands. However, there's three key factors yet to be determined:

- Availability.
- Reliability.
- Heat dump.

For instance, it seems that the general consensus is that the Iwakis are great pumps, but here in the UK you can't get one (neither the MD20 nor the RD30) for under £200 ($410), and the lead times range for three weeks to one month, depending on model and supplier.

Such price tag and poor availability plus the cost of the PSU makes them prohibitive on this side of the Atlantic, especially considering that you can buy two DDC3.2s with aftermarket tops for half that money and have a better performing solution.

Anyway, is something worth keeping and eye on and see how it develops
Yeah, I've been thinking about a good scientific method for determining heat dump. You could do with with flow rate and temp in/out, but I think that's just too small a number to accurately capture. I'm thinking about measuring temperature change of a determined volume of water but not sure on the setup yet.

It should be a fairly specific percentage of the power consumption, like 75% or something along that line.

I know heat dump is key in determining where more pumping power has a diminishing return. I don't quite have my hands around it. I have to think radiator capacity is also an imporatant part of that.

Maybe for starters I could at least have these power consumption curves added into the estimator to give you wattage consumed for the pump....it would be a start anyway.