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Adding dhw priority to tekmar 261
We have 2 boilers for space heating and a seperate water heater boiler with 2 storage tanks 100 gals each (edited for clarity) 3 gas burning appliances all mid eff currently.
Was recommended to us and I like the idea to get rid of hot water heater and replace with a heat exchanger utilizing the spare capacity of the boilers.
Our tekmar 261 doesn't have hot water priority, so is there a some way to add dhw priority and not lose the 261 functions or cause conflicts?
I was looking at the taco pc 702 as an alternative which has dhw priority but I'm not sure if we need another control with it. All we have is the hot water and a 2 stage boiler setup with one zone for heating. I've seen using zone controls in conjunction with it.
The tekmar 274 seems like it would work by itself without other controls but also $$$.
Our contractor is great but wants to get rid of 261 and just add relay for dhw but I'm concerned about losing features like boiler rotation, wwsd, outdoor reset, differential, etc. Maybe those are just marketing but I think they help to some degree.
What's your thinking and thanks for your input!