Schematic for oil boilers and propane boilers in the same house on the same system

Adk1guy

I have a cousin I am recommending get mod con propane boilers but keep her modern oil boilers to have a choice of which fuel to use and I need a design.

I did this in my own home. I designed a wall mounted distribution panel and have both the propane boiler and the oil boiler piped on closely spaced tees into the primary loop. It requires manually manipulating valves and power.

I like my set up and it runs flawlessly( but my 100 gallons of oil is getting stale) But not only do I not do installations for other people anymore, I am under a contract not to. The local fuel companies have newbie techs focused on "no heat" service calls. The first words out of there mouths is "the first thing we have to do is tear out these oil fired boilers". I expect we will get the same from any given mechanical contractor. I get no respect from either, after all I only learned the trade as a child, was in the business for 45 years yada yada yada, so I need an expert from out of town for a design. Anyone have ideas?

Jamie Hall

Seems fine to me. If you wanted to get fancy you could replace the changeover valves with power operated ones and a switch, but that's overkill.

As to whom to get to install it. Dunno. If you can't do it, do you have any old timer friends who can with some quiet oversight?

Hot_water_fan

This is for a house or something larger? If a house, I think this is over complicating things greatly. Plus you probably have better options outside of propane anyway

hot_rod

here is a nice piping option, one or both boilers can run without effecting one another

We call it hybrid piping when a mod con and conventional boiler are piped together

One control option allows the oil fired to come online once the mod con can no longer condense. An outdoor reset function could make that decision

It comes down to the type if heat emitters, typical weather conditions, and how fuel costs and efficiencies match

Or the oil fired for redundancy only

hot_rod

Like this

Adk1guy

Hot Rod, this is what I am looking for. Thank you