For me top unit with great price / value.  Small tips for beginners:

For me top unit with great price / value. Small tips for beginners:

Trixie 87300 Aquarium heater AH 300, 25 W (Misc.)

Customer Review

First:
The aquarium heater works fine in my 30l Nano. The quality is fine,
Labeling as the minimum water level are present and the temperature setting
takes place smoothly with large-read scale.
The prawns are satisfied and hence there is of me a buy recommendation.

Now for a few tips based on other reviews:

Unfortunately here no indication is made for that volume of water this heater is sufficient.
Beginners, it can happen so that they will buy this heater even though they have a lot to Great Basin and then wonder "that there is nothing".
However, this heater is suitable with its 25 watts normally only suitable for use in very small pools. Of course, the ambient temperature is also included with,
because the colder it is, the higher is the difference what he has to compensate.

Here the data from TRIXIE (Google used!):

Product No. Watt liter
87300 25 W 1530 l
87301 50 W 3060 l
87302 100 W 60110 l
87303 150 W 110160 l
87304 200 W 160 220 l
87305 300 W 220320 l

One should also remember that the space heating maybe even on the back burner runs (leave, etc.) and thus the room temperature under the "normal" sinks.

Here there is a small online calculator that provides a clue and the ambient temperature involves with:

>>>>

!!!!!!!! IMPORTANT !!!!!!!!

Here is often reported that the heater kills the fish.

It can of course be a coincidence, and another phenomenon is associated with the device. Finally, many buy indeed such a thing if your aquarium
fresh set. If it is not running right still so much not. Here it makes whatever appears as if many to only buy the fish and then
build the aquarium außenrum. In which the fault does not depend in the aquarium but is left out of the disc. For start-up phase, there are countless instructions.
However, I want to exclude completely not necessarily that in such stories is there any truth.
Primarily as part is to make very, very thoroughly clean. It can always chemical contaminants to new hunting paraphernalia hang until removed
Need to become. Gently but please with operations such as scalding, because the thing is indeed partially made of glass. Also, I have the heater beforehand in a bucket a
Run the sample tag and observed whether the thermostat is working and the temperature is measured. A malfunction in the bucket I do not care, have cooked shrimp
But I prefer the restaurant.
Despite the fact that my dwarf shrimps extremely sensitive animals to bacteria or chemicals are all live and are unchanged active for weeks.

,
,

It runs at the beginning often not all plain sailing, because so many factors to get involved. So I wondered why my prawns were always so sluggish and many many
died even though the pool was well broken in. Until I came one day out that behind the shower in which I moved into the water a long time
Copper pipes are located. Copper is absolutely lethal for these animals. Since then, I use a small reverse osmosis system and give again added special salt.
The animals swim now much fitter through the pelvis and multiply like mad;)

So: Do ​​not be discouraged and have fun in the great hobby :)

Very satisfied 140 Rank: 5/5
October 5
A happy christmas :) Rank: 5/5
January 15
only in Deco Rank: 1/5
July 7
Solid - I highly recommend Rank: 5/5
July 2
Super sweat ... 2 Rank: 5/5
March 11
HEADPHONES WIRED USB Rank: 4/5
August 17

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