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.

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

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