Repair or Replace Amtrol Boliermate Classic?

I have an Amtrol Boilermate Classic model WH-7P indirect hot water heater which is only a few years old and was working perfectly. Recently the Smart Controller on it started making a buzzing sound intermittently. It also would sometimes start my oil burner up 5-6 times in a row over 2 minute period of time. I have shut it down and temporarily switched back over to my old electric hot water heater which I left in line when I installed the Amtrol. Amtrol's technical service tells me that the problem is a relay on the Smart Controller which has gone bad. The only solution they tell me is to replace the entire Smart Controller for about $150-$160.

Does anyone have any experience with this issue?

Surely the relay must be available someplace to allow a cheaper repair than $160 for a whole new Smart Controller, no?

Do you think with the increased cost of oil that an idrect hot water heater still is more efficient than a tank type electric hotwater heater?

How about an oil fired instant hot water heating system or electric?

Thanks in advance for any help you can give me.

Yes- I have expirienced your same problem. My smart control on the Boilermate failed as well. Apparently they are supposed to be wired to 24v and not 120v. Amtrol customer sevice was very good about sending me a replacement at no charge. This wiring change is supposed to extend the life of the Smart Control (which is only warrantyed for 1 yr). My boilermate is 3 yrs old. I simply explained this to the customer service person and they were very helpful. This information came to me from my plumber. Hopefully this helps. JOe