Convert radiant floor heat source to domestic hot water

[ClarkB]

Our gas boiler died and we will replace this summer. We have four zones—three for baseboards upstairs, one for ground-floor in-concrete radiant floor heat. I would like to convert the radiant floor heat zone to its own system with a heat exchanger from domestic hot water source. What’s the simplest way to do this? Obviously will need a circulator pump. Water refill? Air release? Glycol? Expansion tank? Would a heat pump regulate it to a consistent temp (say 68 F) without needing a thermostat? Thanks in advance.

 

[Engineer_Usama]

I can design for you if you want.

 

[Sponsor]

 

[Fitter30]

Have any idea how many feet of tubing the floor heat has and size of pipe By using a water heater for both dhw and heat there's two problems. One is your robbing btu's from dhw second is the only way for work around the relay to turn both pumps on. Flow switch makes on flow powers a relay contact opens in heating pumps circuit pumps turn off till dhw flow stops. Timer is used to stop short cycling. Heat exchanger and pump has to be for potable water

https://www.amazon.com/Delay-Timer-Relay-Second-Socket/dp/B08CV58X9Z/ref=asc_df_B08CV58X9Z/?tag=hyprod-20&linkCode=df0&hvadid=459579282194&hvpos=&hvnetw=g&hvrand=8445737264804611845&hvpone=&hvptwo=&hvqmt=&hvdev=t&hvdvcmdl=&hvlocint=&hvlocphy=200619&hvtargid=pla-943841649728&psc=1&mcid=571da9351c173128853359e76a654c79&gclid=EAIaIQobChMI67_IhYbohQMV70X_AR2dtgQKEAQYCyABEgI31vD_BwE