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How To Make Current System More Efficient
Hi. I'll be installing a pellet boiler in parallel with an existing boiler in a 10 year old 2000 ft2 colonial with two baseboard zones driven by a Taco 007 circ pump each pumped towards the return header. A new edition will a 120 gallon buffer tank, with 11 gal of that used by a stainless coil for dhw. The existing expansion tank is on the supply header.
How can I make things more efficient? Should I convert the pumps to zone valves and put a variable speed pump right after a new air separator (Spirovent?) and expansion tank off of the buffer tank so that it 'pumps away' from the heat source, which will now be the buffer tank? Is pumping away that desireable? It's not like the high end zone valves are that big a money saver over pumps. I can see for energy savings, but reliability? How about two ECM pumps to replace the existing pumps, continuing to pump to the return?
I can't realistically tear up floors and ceiling to add pipe,panel radiators, etc but would like to do somewhat of a makeover for more efficiency, heating and electrically, but not neglecting reliability.
Thanks for any suggestions.