I have only three 10AWG wires to work with run from the house to the pool. I have two main devices to connect, a pool pump (220VAC, 8A) and a pool heater (120VAC, 15A maximum) as well as a couple lights and plugs. I was going to put a double pole 30A breaker in the house and then connect the two poles first to the pool pump (8A) and then to a breaker box to have the heater on a breaker from one 15A breaker on one pole and then the lights and stuff on the other.
I wanted to know if my solution is O.K. and if there are any better answers.

Thanks in advance!

You 100% cannot have 240v loads and 120v loads with only three conductors.
You also cannot install a panel that will serve both 240v and 120v with only three wires.

Also, when you say "to the pool" what does that mean. If the runs are to each piece of equipment that's fine, but you cannot serve a structure with more than one circuit or one multi-wire circuit.

You also cannot have standard 120v 15A or 20A receptacles on a 30A circuit.

Considering what you have stated here, and that this is a pool, I think you'll be much better off hiring a pro to sort all this out.

You 100% cannot have 240v loads and 120v loads with only three conductors.
You also cannot install a panel that will serve both 240v and 120v with only three wires.

Also, when you say "to the pool" what does that mean. If the runs are to each piece of equipment that's fine, but you cannot serve a structure with more than one circuit or one multi-wire circuit.

You also cannot have standard 120v 15A or 20A receptacles on a 30A circuit.

Considering what you have stated here, and that this is a pool, I think you'll be much better off hiring a pro to sort all this out.

Maybe I wasn't clear but I have a three conductor cable going out, plus a ground so that I have 2 phases and a neutral. It's going out to a pool house... I don't quite understand not being able to serve one structure with more than one circuit...

If it is cable then you cannot use it at all for the pool equipment. Pool equipment such as this must have an insulated grounding conductor. A bare conductor in cable does not meet this requirement.
Same goes for the feeder to a pool panel.

If it is cable then you cannot use it at all for the pool equipment. Pool equipment such as this must have an insulated grounding conductor. A bare conductor in cable does not meet this requirement.
Same goes for the feeder to a pool panel.


Its all insulated it is 3 conductor cable with ground, rated for underground... my main concern is the load.

Thanks

The ground is not insulated as I stated.

My concern is that I give advice on a safe and complaint installation.
This all gets worse if one of the lights you are talking about is inside the pool.

There are no wires running anywhere near the pool itself, the wires go to a pool shed and then to equipment within the shed... only plumbing goes to the pool