this post was submitted on 20 Nov 2025
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The pressure from the wall is better than you might expect: nearly all shower heads have a pressure regulator inside of it - I'm assuming this is a legal requirement that manufacturers know users hate, cuz they tend to be easy to get at and bright red or blue. So, you'll want to pop the pressure regulator out of both heads.
Full wall spout pressure divided by two unregulated heads yields plenty on each side.
The issue you might run into is that your hot water will run out way faster than previously... then again, I live in an apartment, so I'm assuming our water heater is the cheapest shittiest one on the market, so you might have better luck on that front.
Reason why I asked is because I've tried a dual showerhead before and it sucked ass. It was completely useless unless one of the nozzles was off.
I'm just curious if you know the answer: does the regulator attenuate the pressure downwards even if the overall pressure is below the target? Say the pressure at the spigot is 100 psi, but legally must be at 40psi, so the regulator attenuates it down to 40. If you divide it into the two shower heads, will the regulators simply attenuate it down to 40 psi, or cut it down to something like 20 psi?
Anecdotally, one head w/ regulator at the start of the project vs 2 heads w/ regulators near the end of the project made a noticeable dip in pressure from each side. I thought the whole project was a bust - like, it was struggling to even rinse the soap off; but looked up ways to increase the pressure and found out about the regulators in the heads. Popped em out, and problem completely resolved.
You can still regulate the pressure manually too, using the valves on the t-connector. Ours are usually only open around 75% because they were murdering out hot water tank at full blast, and we'd run out of hot water with nearly every shower.
The regulator and water pressure both impact flow rate. Though as they said, remove the regulator and it's unlikely to be an issue.