We are using a really old HS Tarm boiler and now that oil prices are high and getting higher,
I'm thinking that my hotwater shouldn't be using oil at all.
During mild weather, we use the Sanyo mini-split (ASHP) for space heating.
But, when the temps get down under 10 or 15 degrees F, I have to use some oil..
This winter has been especially cold. Using way too much oil now.