We use the MoreBeer counter-flow chiller on all of our spike systems

https://www.morebeer.com/products/wort-chiller-counterflow-12-fpt-fittings.html


To get your wort to room temperature it's suggested you hook the water up to the coldest water supply available and throttle back your wort flow from the pump as to allow it enough time in the chiller for it to cool down enough.


It has about ~.2 gallons of deadspace.