Replace Stuck Automatic Valve

I need an automatic hot water valve, likely a Honeywell, replaced in my loft. The current valve is stuck open, causing constant hot water demand. Requirements: - Remove old valve - Install new valve... (Budget: ₹12500 - ₹37500 INR, Jobs: CAD/CAM, Heating Systems, HVAC, Installation, Manufacturing Design, Mechanical Engineering, Plumbing, Solidworks)