Boiler room strat, read if stuck!

[STANN.co]

This features slim spoilers, but if you're looking for this you probably know about the rooms i'll mention anyway

This isn't a bullet proof way to get the boiler room connected where you need it. But it will help!

When you get the boiler room, and you draft a door, you have a very slim chance of getting a room that actually connects with the boiler. So what can you do??

The solution. Draft rooms with power conduits in the ceiling! Like the 4 way hallway. And here's another pro-trip, a good chunk of the red rooms have power conduits!
You can choose the bunker, as your outside room to negate the first 3 red rooms negative effects. And try and get as many red rooms, and extra power conduit having rooms connected as possible.

Then once that is laid out. Try each door and get the rooms you want. Boiler first of all, pump-room, garage, laundry, laboratory so on.

Furthermore, if you're able to change the rarity of rooms, try and make those rooms more common! If you ever get the wrench this can also be used for that.

This is a strat to tip the odds in your favor. It's still not guarenteed, but this frustrated me for a long time, so this can hopefully help others.

[Rotting Pastry]

All of this is great advice. I'll add there is an RNG short circuit if you play the game enough.

Mild spoiler for it: It involves the Observatory
Major spoiler for it: There is a 50 star constellation that lets you use stars as rerolls. So on the run you have 50+ stars, you have 50+ rerolls

[Doombringer]

Another note about Boiler room.
You will never enter it from the sealed door (even if you solved it so the door is always open).
So unlike other 3-way rooms you can't rotate it 3 ways (only 2).

[Pinstar]

Does anyone have a full list of exactly which rooms have boiler connections?

[Frankie Bag o' Tricks]

Make sure you draft the boiler room in a space where you can draft off from it once it's placed.
Activate the boiler.
Move the power to the door you are about to draft off of.
You are like 90% guaranteed to get 3 rooms with duct work in them. It also highlights rooms with a blue square that are endpoints for the power (lab, pump room, garage)

[Astroooooooo]

Something that surprised me was that another room can also provide power when upgraded:

when you get the Upgrade Disk for the Aquarium, you can add Electric Eels to a tank, and yup, it provides power to connecting rooms just like the Boiler Room

[Doombringer]

You really only need power to lab once and pump room once (maybe twice if you run out of steps/keys), then it isn't such a big deal.
(It still lets Laundromat do funny stuff though.)