Comparison Vaillant Allstor Plus VPS 500/3-5 494 L vs Vaillant Allstor Exclusiv VPS 500/3-7 491 L

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	Vaillant Allstor Plus VPS 500/3-5 494 L	Vaillant Allstor Exclusiv VPS 500/3-7 491 L
	from $1,367.21 up to $1,487.00 Outdated Product	from $1,698.15 up to $1,846.92 Outdated Product
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Main		Layer heating. Possibility of installation of external stations of preparation of hot water and accumulation of solar energy. 8 sleeves for connecting temperature sensors.
Tank volume	494 L	491 L
Type of instalation	vertical	vertical
Specs
Max. tank temperature	95 °C	95 °C
Max. tank pressure	3 bar	3 bar
Number of heat exchangers	no heat exchanger	no heat exchanger
Storage tank material	carbon steel	carbon steel
General specs
Connection size	1 1/2"
Dimensions	930x1813 mm	930x1813 mm
Weight	90 kg	90 kg
Country of origin	Germany	Germany
Added to E-Catalog	december 2015	december 2015

Tank volume

The total volume of the tank. For models with a storage tank (see “ Storage tank volume”), the full volume is usually indicated, taking into account the storage tank volume; accordingly, the working volume of the tank will be the difference between the total volume and the volume of the storage tank. However, these details for each model should be clarified separately.

The choice for this parameter depends primarily on the scale of the heating system and the power of the heater. Too small a tank will not be able to accumulate enough heat, and too large a tank will lead to unnecessary energy consumption, and it will take up a lot of space. The most general rule says that for every kilowatt of power of the boiler, there should be from 25 to 50 litres of the working volume of the hot water storage tank. There are more detailed calculation formulas that take into account various additional factors; they can be found in special sources.

Connection size

The diameter of the connecting pipes provided in the storage tank. Traditionally specified in inches and fractions of an inch — for example, 1/2" or 1 1/4"; at the same time, the larger the tank, the larger the connection.

In some cases, it is allowed to connect pipes of a different diameter to the heat accumulator through appropriate adapters.