I have a gas boiler that circulates hot water to baseboard fin heat (not radiators). It is 2 zone, and does not have the gardeen hose/check valve fittings for easy purging of air. I want to add these, and at the same time correct what I think was a reversing of the outflow/return pipes. On the current outflow, from the circulating pump, there is an expansion tank with spirovent microbubble reprocessor and automatic water feed. If I try to correct the prior mistake, the expansion tank/spirovent/water feed will be on the return side, close to the boiler. Any risk or inefficiency having the expansion tank/spirovent microbubble reprocessor/auto water feed on the return side - very close the boiler? Thanks.