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I am still trying to wrap my head around the size of a replacement boiler.
Here is the scenario. Mega Steam wanted.
EDR of system = 407 10 Radiators - most 3 col 26" a couple of 5 tube radiators.
<strong>Current boiler</strong> - Peerless JOTTW 175 646 edr 1.75gph - apparently way oversized but never trips the vaporstat. Runs at 2-3 oz throughout the heating cycle even on a long recovery from setback. Riello F-5 burner 1.25 nozzle ( assuming 140 psi at pump ). Oil guy gave it an 80% efficiency rating after servicing and recommend it be replaced
<strong>1st possible replacement</strong> - Burnham MST 396 - 396edr 1.05 gph - EDR says its the right size but the difference ( 39%) from the current boiler is huge. I am a little concerned that it will not get the job done.
<strong>2nd possible replacement</strong> - Burnham MST 513 513 edr 1.35gph - EDR says it should be too big but it is 21% smaller than the current boiler.
Any insight would be greatly appreciated.
link to current system <a href="http://www.heatinghelp.com/forum-thread/136919/Almost-done#p1234763">http://www.heatinghelp.com/forum-thread/136919/Almost-done#p1234763</a>