Do I have too many plugs connected to one wall socket?

My power bar is 6 outlets so 2 power bars is 12.  The wall outlet has 2 outlets so1 outlet per power bar.  You got 11 things.

If you need a heater then disconnect one power bar from wall outlet and get a heavy duty 6 foot extension cord and plug that into the outlet and  plug the heater into the other end You should have more than one female outlet on the extension cord so you can plug the power bar into that for the other stuff.  Hopefully your heater has a thermostat so you can regulate the on and off of the heater so it is not always burning.  That should work without you blowing the breaker.  That is what will happen first.  Way before the house catches on fire.  If you blow the breaker then you know the heater needs a different outlet....so longer extension cord from a hallway outlet perhaps?

Your electronics is not pulling that much power.

most appliances should have a rating plate telling you what power it uses.

it coudl be expressed as watts or amps.

watts = volts x amps.

sum up the active devices and make certain the ampage doesn't exceed the rated supply for that socket.

In the UK a standard ring main is good for 13 Amps

I think the USA & Canada are 15 Amps

If you are getting close to the limits consider fitting a dual socket outlet, as opposed to dasiy chaining extensions. fitting a dual socket outlet wont reduce the power draw on the wiring behind the socket but it shoudl reduce the load through the socket, and reduce the risk of overloading leading to a potential fire riskIf you MUST dasiy chain extension leads then make certain you run the highest draw appliances on the first extension lead, NOT chained ones.If you MUST dasiy chain extension leads then make certain the first extension lead is rated at 13/15 Amps IE has a chunker less flexible cable

The quantity of things associated doesn't make any difference.

What DOES matter is the complete electrical burden conveyed by the divider outlet. The things you recorded are altogether generally low-power things,

which will hold your all out burden back from being an issue.

If they're all on at the same time, that's a good recipe for electrical overload and fire.

You'd need to use something like a Kill-A-Watt to see just how much all that stuff is drawing from the socket.

Generally speaking it's not advised to daisy chain strips because it makes it much easier to exceed the limits of your wall outlets which, at best will only trip the breaker and not cause damage, and at worst short something and cause damage or a fire.

The average USA wall socket is around 15A at 110-120V. If you're below that, you're more or less safe, but you'd probably do well to just get one singular power center/surge protector that has as many plugs as you need. They do make 12-outlet ones.

it depends on you current , you can get a power board with 6 outlets but it all depend on the current , wall plugs usual run at 10 amp , or a 110 volt at 10 amps , a strip heater yes , but its close to the limit of you socket .

A power point overload occurs when you exceed the maximum amperage of the electrical circuit you are using. This can be caused by plugging too many appliances into the one power point or running appliances that draw high amps at the same time. The result of an overload can be a short circuit and quite possibly a fire.

The number of things connected does not matter.    

What DOES matter is the total electrical load carried by the wall outlet. 

The things you listed are all relatively low-power items,  

which will keep your total load from being a problem.  

How many is too many. Jeez, I have 2 10 socket strips chained with a 6 socket hosting that.

Typical wall sockets are rated 15 amp so as long as the total current doesn't exceed that, you are OK.

I do have a second wall socet, 6 outlet strip with 20 amp circuit breaker. Runs a refrigerator, microwave, and coffee pot.

All 3 running at once will tip the breaker, any 2 is fine.

All this is on one socket with a dozen wall warts you can't see:

THe typical outlet in an American home can support 1500 watts of devices . . .  the devices you list don't draw much power but you would have to add them all up yourself to make sure.