In fairness to all, we don't discuss pricing on the Wall. Thanks for your cooperation.
Over the years, we must have installed over a hundred Munchkins and I still service them for my customers. Yesterday, I visited a job where we installed a Munchkin for radiant heat in 2003 and had cleaned the boiler 3 years ago. The customer told me that the pressure was at zero and she couldn't fill it and make the pressure hold. Often, it's a stuck open relief valve and I brought one with me, but no, I could hear water spraying in the combustion chamber and flowing out the drain.
That's a first for me, but the techie at HTP wasn't phased. "Just get them a new boiler".
Often wrong, never in doubt.