Does anyone know what they mean by "The range is +/-40 to +/-70"?

Thomas, that is the range of the water temperature. The minimum temperature that the thermostat will regulate is 40C and the maximum is 70C. The recommended temperature for a hot water cylinder is between 60C and 65C. Below 60C microbes can accumulate in the hot water system. 65C is very hot and should be the maximum setting for most applications.

Does this actually include the heating element or not, the description is inconclusive?

No, it's just a thermostat, to work with the immersion heater that's already in the tank. A new installation will probably have a thermostat supplied with the immersion heater, this is just a replacement thermostat.

How long is this thermostat actually, the description mentions is 7inch, 11inch and 18inch?

Different sizes for different boilers

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⚡ Stay in control with power and safety that never quits!

ROBUST 2 7 KW POWER - Delivers rapid and consistent heating performance
COMPACT LIGHTWEIGHT - Easy installation with a sleek 49.9g design that fits seamlessly
PRECISION 7 INCH BLADE - Optimized length for efficient heat transfer in water cylinders
BUILT IN SAFETY CUT OUT - Automatic fault detection with manual reset for peace of mind
DURABLE STAINLESS STEEL - Corrosion-resistant material ensures long-lasting reliability

The Duratherm Resetable Immersion Heater Thermostat 7 Inch (49020307) is a high-performance water cylinder thermostat featuring a 7-inch stainless steel blade and 2.7 KW heating capacity. Designed with an integrated manual reset safety cut-out, it ensures reliable fault protection while delivering efficient, rapid heating. Lightweight and compact, this thermostat is engineered for easy installation and long-term durability, making it an essential upgrade for modern home heating systems.

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Manufacturer	Mueller Primaflow
Part Number	49020307
Package Dimensions	21.3 x 7 x 4 cm; 49.9 g
Manufacturer reference	49020307
Material	Stainless Steel
Wattage	2.7 KW
Item Package Quantity	1
Number of Pieces	1
Batteries included?	No
Batteries Required?	No
Item Weight	49.9 g

Duratherm Resetable Immersion Heater Thermostat 7 Inch 49020307

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