kurtg

I just pulled a heater out of my sump. It was 82.8 and it was still
heating.

How often do these go haywire? There seems to be lots of stories of run
away devices. You'd think they could design them to fail by turning off
rather then on.

I certainly like my digital thermometer w/ an alarm. I think it just
earned the $10 I spent on it.

--Kurt

george patterson

That depends. I used to have heaters made by Supreme. These had, as many others
do, "thermostats" that were metallic expansion segments which separated a pair
of electrical contacts. The general idea is that the segments will expand as
they heat up and force the contacts apart. That cuts off the power to the
heating coils.

These things had a nasty reputation for sticking; almost always in the "on"
position. It became a not-so-fun game to try to replace the thermostat before it
went bad. I replaced my heaters years ago with the "Tronic" brand, which have an
electronic thermostat. I've been told that, when these fail, they tend to fail
in the "off" position. Mine have not failed in over ten years, but they do seem
to need adjustment every few months these days (they didn't when I first bought
them).

Once burned, twice careful, though. I still keep two heaters on my tank. Each
one is about half the size the tank really needs. If one goes haywire, it's not
large enough to really boil anybody. I wouldn't be adverse to using three, if
that's what it takes to keep everyone alive.

The Supremes used to go bad about every three to five years.

George Patterson
No one ever says "It's only a game." when his team is winning.

no spam

Another option is to put them on a controller of some sorts. All mine are
plugged into my Reefkeepers or Reefkeeper 2`s. They will operate normally
until it hits its set thermostat setting. If for some reason it sticks on
the Reefkeepers will shut that power plug down at a pre-set temp and shut it
off. I have mine set 2 degrees above the heaters set point. Its like a
double safety switch in case of failure.
I had a friend that had a 200 watt model stick on and it turned his tank
into a cooked marine based soup. Not pretty nor pleasingly aromatic in the
end...

kurtg

Great idea. I was thinking of how to design something like this, but
then quickly came to the conclusion that it would need to be a
controller of some sort.

Thanks for the recommendation on reefkeepers. That looks like a
reasonable solution for less money then I'd expect.

--Kurt

pszemol

With even less money you could go with old trusty solution
to use two smaller heaters instead of one big one.
There is very little chance that both heaters fail at the same time.
So one failed heater will not create a disaster in the tank
and with your current termometer you will detect the temperatrue off
the limit and replace the failed heater - no expensive controller
necessary..

kurtg

I already have that going. Problem is that I travel a lot and I'm not
sure my house sitter will be able to diagnose the problem should it arise.

--Kurt

no spam

Agreed there also but look at all the other things a controller can help
with. It cost more but the Reefkeeper 2 will shut the lights off if over
tank if temp gets too high also. It will then kick them back on after
episode is over. You can control lights, heaters, chillers, fans, power( has
wavemaker control), PH control function, feed mode and gets rid of all those
pesky power strips..
To me it was worth the cost for all the safety features like heater control
and all the other controls. I have a calcium reactor that uses the PH
function on it also on one tank. If PH gets out of wack the controller shuts
off the regulator and stops it. On other smaller tank if PH gets high it
shuts down my Kalk Reactor.

If you go this route you can put the money from the cost of a smaller
secondary heater to the cost of the controller....LOL

Been using them for 2 yrs on my tanks and have never had a malfunction on
either due to heat or PH swings/malfunctions.

tristan

I ofund out a long time ago the biggest weak link in a setup be it
fresh or salt is the heater.......MOst SW will continue on if lights
go oout or if a p[ump or p ower head fials as they usually have more
than one pump or powehead, but a heater that fails to keep a tank
warm enough or one that boils the inhabitands is sure not good to
have. I use a separate temperature ocntrol unit anymore on all my
tanks. Expensive....yes and no......Its not as expensive as some of
the fish or corals we buy are, so when yu consider the value of corals
and fish in a tank, they are really cheap to buy for peace of mind.

I use the Aqua Logic Digital Temp controls that AES sells for a bit
more than $100. I set the temp onthe controller to what I want, turn
up heater to that point or just a bit above,or even on HI, and plug
it into the controller, drop controllers sensor and the heater into
the tank, turn it all on and for the most paart ignore it. Its got a
digiotal display to indicate settings and temp of tank or even air. I
played with one of these controllers to turn on my fans automatically,
but then came up with a schematic for a thermistor (I think thats the
right term) to control my fans...)which worked fine, but I have since
lost track of my schematic...as I think working of water temp would be
a better more accurate method than working off air temp..... and my
unit has died, and I am not that electronics savy) anyway any decent
quality heater controled by Aqua Logic controller is pretty darn
reliable and bullet proof........lots more so than the controls found
in a typical heater.

I use the TC11 mainly but do have two TC12's in use as well, as they
control other devices like my home brew chiller etc.


I use the


<<>>
<<>>I just pulled a heater out of my sump. It was 82.8 and it was still
<<>>heating.
<<>>
<<>>How often do these go haywire? There seems to be lots of stories of run
<<>>away devices. You'd think they could design them to fail by turning off
<<>>rather then on.
<<>>
<<>>I certainly like my digital thermometer w/ an alarm. I think it just
<<>>earned the $10 I spent on it.
<<>>
<<>>--Kurt

-------
I forgot more about ponds and koi than I'll ever know!

kurtg

I'll have to see this setup. And, sample the home brew....

Any rain your way? We had some t-boomers last night that chased out the
cold air, but nothing like the folks in Lake County had.

--Kurt

tristan

Yep, lots of heavy rains last night and also this morning.
Ah, that home brew chiller is not a chiller to keep my home brew cold
but a DIY homebrew chiller for an aquarium ;-)

Home brew is good!

<<>>Tristan wrote:
<<>>> I use the TC11 mainly but do have two TC12's in use as well, as they
<<>>> control other devices like my home brew chiller etc.
<<>>
<<>>I'll have to see this setup. And, sample the home brew....
<<>>
<<>>Any rain your way? We had some t-boomers last night that chased out the
<<>>cold air, but nothing like the folks in Lake County had.
<<>>
<<>>--Kurt

-------
I forgot more about ponds and koi than I'll ever know!