The two are discrete and different.

Quantum physics treats particles and their properties as the probability that they hold those quantities and positions. Define the actual value of one, and the probability that it holds the others spreads out and smears. THAT's the Heisenberg principle. Nothing to do with observation, it's in the theory.

On the other hand, observer effect is a crude, macrocosmic effect as described above, and is very real. It may also be present in softer sciences such as psychology and sociology, and in the design of clinical trials, but it has nothing to do with quantum physics.

The drop of water and the thermometer is only an anology, and as scuh cannot be compared too closely.
JOhn