I'm not using this mod (I prefer Ice Ore). But since I was asked to comment:
If I installed the mod then I would expect the electric pump to give the same amount of water so that my currently working blueprints would still work as normal. Anything else would require some major benefit for the annoyance of my setup to be broken to be worth it.
I would also say that the gameplay benefit of this mod isn't really the cost. The interesting thing about it is that
- it is no longer "free" and
- You need to make sure your design can be restarted after a brownout -> blackout death spiral.
The energy cost should be reasonable, if it is too high then it's not really about the 2 points I mentioned but instead about mining a lot of coal and making your whole power plant unreasonably big to just pump water.
1200kW for the electric one sounds like a lot, but it does also give quite a lot of water which reduces the energy cost/litre water to reasonable levels. It would mean that 3.33% of all power would be driving the water pumps to the boilers giving you energy. And you can use 2xEM1 or 2xEM2 in them to reduce the energy cost quite a bit with only a few modules. Since modules are allowed it might even be ok to have it use even more power.
An EM1 module reduces power by 30% and costs similar to a solar panel. 30% of 1200kW = 360kW. And a solar panel gives 42kW average. EM1 in an assembler3 reduces power by 112.5kW for comparison. Since modules are already so effective in the pumps I wouldn't really mind if unmoduled pumps required like 2400kW. It would be a nice reward for anyone that figures out how useful efficiency modules are in them also.
For the burner offshore pump it isn't that annoying if the pump gives out less water. Most people aren't using blueprints at this stage and you don't need the power that 20 boilers in a row would give you either. And you probably don't have that much space for it either. And if you increase power cost/s of the burner offshore pump a lot then you just have instantly disappearing coal which would be a bit weird. So reducing water/second to increase energy/litre water is a fine solution as long as the electric pumps that give 1200 water/second are available in the mid game.
You already can't module the burner offshore pump (right?) so it seems fine if it uses same/similar amount of energy/litre as the electric pump. Burner entities are usually less efficient and since the electric one benefits so much from modules it doesn't really need to be more efficient when it has no modules.
I think 25% of the water (so enough for 5 boilers in a row) is a reasonable amount of water to get from a burner pump. So maybe 300/s for 600kW to match 2.4MW for 1200water/s for the electric one.
That's 66% of one of your 10 steam engines that are supported by the burner pump.
That's also 6.66% of all your power going to your pump. But it is only until you get the electric one (when do you get that one?) so I don't think it would be too much.
60 water/s was suggested for the burner pump earlier, but then you only get 1 boiler per offshore pump. And you also can't place the offshore pumps anywhere so that would get really annoying. It seems way too low. That's lower than "Drill to Aquifer" and it can be placed anywhere (and it still seems like it might be a bit too low for that). Since you are bound by
- coal use
- availability of lakes
- and also constrained by the shape of the shore
I really think 60 water/s would just make it more annoying than interesting until you can get the electric pump.
These are my initial thoughts.
Edit: Fixed: GW -> MW.