I didn't know if this would work but I found that by connecting the supply to the inlet of the heat exchanger and the cold valve I had no pressure drop allowing the valve to work. There seems to be enough current. Hope this will be helpful.
Vacuum cleaner Dreame V9 Global, white
145 Review
DIGITEN DC 12V 1/4" Inlet Feed Water Solenoid Valve Quick Connect N/C Normally Closed No Water Pressure
14 Review
High-Quality QiiMii Stainless Steel Sanitary Clamp With Silicone Gasket - 2 Inch, Single Pin Tri Clover Design
16 Review
1 Inch Beduan Brass Electric Solenoid Valve, 12V Normally Closed Air Valve For Water, Gas, Fuel, And Oil
10 Review