7300/2 pump added 3 degrees to my tank?

[ammiller2]

Roger -

Tonight was Tunze-installation night in Cleveland! I got the Osmomat installed with the Calcium Dispenser inline and I couldn't be happier!! This thing is going to change my life as I was previously manually topping off. Everything is great with the Osmomat.

But when I got the 7300/2 installed (actually the 7310/2 kit from MarineDepot) I was very surprised to see that my tank temp went from 79F up to 82F, with the MH lights off! Lights have been off for 2+ hours now and the temp stands at 82F.

I run a Ranco dual stage temp controller, so I trust the readings are accurate. I was previously kicking on a fan when it hit 80F and turning on the heater when it hit 78F. I've adjusted the for the added heat, but did not expect a 3 degree increase. Very worried about the summer.

The 7300/2 actually replaced 4 Hagen AquaClear 201 powerheads (each rated at 126 gallons/hr). Those are gone now and the only other heat-producing equipment in the tank is a MaxiJet1200 on my AquaC Remora and the small pump in the Osmomat.

I am noticing a fair amount of "rumbling" from the pump when it is at 30% power. More than I expected, but I related this to break-in and am hoping it will quiet down.

Is this temp increase to be expected on the 7300/2 pump? My tank is an Oceanic 42 Gallon Hex. Any ideas or should I have gone with one of the Turbelle classics?

 

[rvitko]

I would roughly calculate a 1.5-2 degree increase for your size aquarium. We factor .75degrees per 75gallons per 20w of pump draw as a general efficiency for a Turbelle. The relationships aren't linear exactly so a smaller tank will see a greater increase in temp and ambient temperature has an effect as well.

I think of the Classics as a specialty pump that requires a certain person, they are high maintanence old fashioned motors with bearings that need replacements and fans that make noise. True, they add no heat but for most people the noise (about equal to a typical home PC) and the need to either learn the maintanence skills or send in the pump every 2 years for an overhaul preclude there use.

 

[ammiller2]

Just as an update to anyone reading this thread, Roger and I are PM'ing a few ideas back and forth and he is taking care of me.

As the pump is breaking in it doesn't appear to be causing as much of a temp increase. Still a few more things to try but I think everything will be okay.

Thanks for the great customer service Roger!!