• The solar panel is mounted at ground level, with the storage tank raised in the building above to support a thermosyphon effect. Although thermosyphon effect is obviously useful, it is hard to make practical use of it in a solar system. Some small systems manage this, by using small external tanks above the panel (which brings its own problems of insulation in a cold climate). In a building though, the effect of shading on a low-mounted panel far outweighs the thermosyphon benefit - practical panels are mounted as high up as possible, so as to have better sun exposure.

• The circulation system in the panel circulates the entire heat storage tank capacity. Real systems use separate systems with a heat exchanger.

• The systems is drawn with stratified heat storage in the tank, i.e. separate hot and cold layers. Stratification is an important aspect of design for an efficient system, but it can only happen with non-circulating storage and use of heat exchangers.

• The use of #5 "Additional heater" in the solar panel circuit is a bizarre fabrication. If such a heater was provided, it would either be an electric immersion heater inside the storage tank, or else a separate primary circuit and heat exchanger for a heat source such as a wood stove.

• The cited source diagram represents a gas or solid fuel boiler, not a solar panel. Thermosyphon is usual for such systems, but it's not extrapolatable to domestic house solar systems. It's WP:OR to present it as such, and in this case, unworkable WP:OR.

For usage see: {{disputed diagram|why}}