OD reset would save more then the heat timer.
Making that many changes at once, it would be hard to tell how much savings he got from OD reset or the timer.
Very good advise so far. If I could step in and add that an outdoor reset used on the boiler if you're going indirect or electric for your hot water would dramatically decrease fuel usage. A Heatmanager form Beckett or HW+ from Intellidyne would also save money and both come with a 10% savings promised or your money back. I personally use outdoor reset.
OD reset would save more then the heat timer.
Making that many changes at once, it would be hard to tell how much savings he got from OD reset or the timer.
I can personally vouch for the savings potential of an ODR. Can't speak for timers, but in europe I understand they use them alot. The only thing I might caution against is modifying the wiring on the aqua-stat. If doing so might void UL approval I wouldn't and haven't done it. I have seen it done in the field many times though and it seems to operate properly. Just my own personal feeling regarding liability etc.
Letting tankless coil boilers go cold isn't always easy on them. Too much possibility the coil gasket will start leaking. There is also the likelihood of increased scale accumulation in the boiler flueways, especially in a pin-type boiler. Better to lower the aquastat to about 120 and use a relay for the indirect that will start the burner with the circulator. The high side of the aquastat then comes into play. Maintaining some boiler temp provides faster DHW recovery, especially if the boiler is not oversized. After the hot water call is satisfied the boiler temp will drop back to the low setting.
You can use a Beckett AFG with outside air kit instead of the Riello BF. This does reduce considerably air infiltration. It takes almost 1400 cu ft of air to burn one gallon of oil. It has to come from somewhere and if that somewhere is the house outside air comes in to replace it. In winter that air is cold and requires fuel to bring it to room temperature.
What is the average sized indirect for 2 normal HW usage people? Seems like 30 gallons would suffice, but thought I would ask. I was thinking Weil or Superstor.
I just want to say I appreciate all this great knowledge...helps to be a little educated when discussing options with my tech!
I prefer 40 gal. A 26 would be no problem. I just like the spare capacity, and slightly longer burner cycle when it runs the boiler to maintain temp.
man stop heating your water with oil it is such a waste and shortens the life of your boiler. if you dont have a long enough run time to heat up your chimney and vent pipe youll condense your combustion gases and thats not something you want in your boiler and that generally happen in the summer months when it only runs for a couple of min to maintain water temp. and if you keep heating your water with the boiler dont set the temp too low or this could result in alot of short cycling. im not familiar with weil's burners but if it came with beckett replace it with a beckett. the reilos are designed to run a positive draft overfire and if your heat excanger isnt designed for that you will be in for alot of unnecessary service calls. my experience with weil is that they are very hard to get clean unless taken apart properly and their brush is used to clean it. to me it sounds like your burner was not set up properly if it was unreliable and now you have to replace it. if you dont fix the cause for the original failure the same will happen to your new one. id get a second opinion before you replace it and make sure they use a combustion test kit and measure the the smoke ,co2 ,draft ,and flue temp.
Unless your installing a Buderus....then riello is good
But...if you going with a Weil Mclain Pin Boiler....I would go with the Carlin EZ-1
burner...they burn clean ...with the Mclains