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[newmod]

Should the top of the hx loop tee into the blow off vlave on the side or should I tee it into the hot coming into the top of the water heater?  I only ask because my precious hookups were into the blow off valve that was mounted on the top of WH.  My relief comes out of the side of the WH. 

[juddspaintballs]

I prefer to leave the blow-off valve unaltered from the factory.  The hot outlet at the top of the water heater is fine to tee into for your plate exchanger. 

I'm curious, are you using a circulator to move the domestic water through the exchanger or relying on thermosiphon?  Also, have you considered simply using the plate exchanger for on-demand hot water and shutting down the water heater as well as valving it so it's not open to the water system while you're using the plate exchanger?

[RSI]

Just put it in series with the cold line going into the tank. Simplest to install and normally works best.

[newmod]

I prefer to leave the blow-off valve unaltered from the factory.  The hot outlet at the top of the water heater is fine to tee into for your plate exchanger. 

I'm curious, are you using a circulator to move the domestic water through the exchanger or relying on thermosiphon?  Also, have you considered simply using the plate exchanger for on-demand hot water and shutting down the water heater as well as valving it so it's not open to the water system while you're using the plate exchanger?

I just rely on thermosiphon .  The 2 OWB I have owned before I have done the same way without problems.  Thanks