do you have to drain down hot water tank to fit this valve which is replacing a blown one of the same please

It all depends on your system and why / where the valve is installed etc. On my system it was (almost) at the top of the central heating radiator circuit and was completely separate from the hot water storage tank. I just needed to turn off the water supply and electric then drain sufficient water from the radiator loop so the water level and pressure fell sufficiently to allow me to safely replace the valve. I then had to restore the water level and bleed the system etc. Your central heating system is probably very different from mine, so this may not apply in your case. Irrespective of where ithe valve is located in the circuit you will definitely need to at least partially drain your system as the valve is intended to operate under pressure. If in doubt, consult a plumber.

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⚡ Elevate your HVAC game with FlamcoFlexvent – where precision meets power!

CLEAN TESTED - Factory-tested with a dirt-protected seal seat for long-lasting, maintenance-free operation.
PRESSURE TOUGH - Handles up to 6 bar pressure continuously, with peaks up to 10 bar for ultimate durability.
PRECISION CONTROL - 3/8" male thread ensures flawless integration and leak-free performance.
COMPACT POWERHOUSE - Ultra-compact brass housing fits seamlessly into any HVAC setup.
THERMAL RESILIENCE - Operates reliably up to 90°C with peaks at 120°C—built for demanding environments.

The FlamcoFlexvent 3/8" Floatvent with shut-off valve is a compact, brass automatic air vent designed for HVAC systems. It features a 3/8" male thread for easy installation, operates efficiently under pressures up to 6 bar (peak 10 bar), and withstands temperatures up to 90°C (peak 120°C). Factory-tested and DIN certified, it ensures reliable air bleeding with a dirt-protected seal for enhanced durability and energy efficiency.

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Manufacturer	Flamco
Part Number	27750
Product Dimensions	23 x 3 x 80 cm; 10 g
Item model number	27750
Size	R 3⁄8"
Colour	Brass
Material	Brass
Power Source	Wired
Item Package Quantity	1
Maximum Pressure	1E+1 Bars
Certification	DIN
Special Features	Energy Efficient
Batteries included?	No
Batteries Required?	No
Item Weight	10 g

Flamco Flexvent 3/8" Floatvent c/w shut-off valve - Automatic Air Vent 27750

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