Electric Shower Flow Rate & Other Basics [Shower Basics Guide]

Showers are pretty complicated devices. There’s a lot that you’ll need to know in order to troubleshoot, install, and fix them when something goes wrong. Luckily, we at DreamyHome figured it would be prudent to put together a big ole’ list of some of the smaller questions we see asked commonly. In this article, we’ll discuss things like electric shower flow rate, shower valve height, how to reset a Mira shower, and much more. Stay tuned to get all of the basics for electric and traditional showers!

We’re covering a lot today. Among other things, the ideal electric shower flow rate, proper shower valve height, and more. To start things off – the ideal flow rate for an electric shower is 8 litres per minute. This roughly equals between 1 and 10 bars of static shower pressure.

There’s a lot of small things to cover today, so let’s hop right in.

Electric Shower Flow Rate Basics

The ideal water flow rater for an electric shower should be 8 litres per minute. This gives us a minimum mains water pressure of 1 bar, and a maximum of 10 bars (though that’s quite high). Water flow rate can be affected by a number of factors, though the largest distinguishing factor is if it’s manual or thermostatic.

Manual Showers

A manual shower is dependent on water from other parts of the house, unlike a thermostatic shower (but we’ll get to that). A manual shower has no control of the water, leading to an inconsistent flow rate. More advanced, modern manual showers (like a power shower) can get around this. Nonetheless, the flow rate of your manual shower will likely be less consistent than a thermostatic shower. Let’s talk about why, yeah?

Thermostatic Showers

A thermostatic shower uses a pre-set thermostat and a specific valve to control the amount of water that comes to the shower. This is done to regulate the temperature of water in your shower, preventing scalding or freezing water temperatures. To achieve this, your thermostatic shower will constantly alter the amount of hot and cold water being fed through.

This means that the flow rate of your thermostatic shower should remain static, assuming nothing has gone wrong. If you have an inconsistent water heater, this can affect the flow rate – but not by much.

Proper Shower Valve Height

First things first – this will vary pretty heavily based on the exact make and model of your showerhead. Another factor to consider is if you have strictly a shower, or a bath/shower combination. In general, there are a few basic rules of thumb to follow, though. This is because improper shower valve height can cause difficulty in use. The basic guides are as follows:

  • Generally, shower valves should be installed between 38-45 inches (96-114 cm) above the ground.
  • If you have a bathtub, the valve should be roughly 8-18 inches (20-45 cm) above the tub spout.
  • High traffic areas (like public showers) should have a more varied showerhead to accomodate taller users. Generally higher than 80 inches (203 cm) above the ground is recommended.
  • Handheld showerheads should be between 72-84 inches (182-213 cm) above the ground.
  • Rain showerheads generally have a long arm, requiring that they go higher up. They should be roughly 84 inches (213 cm) above the ground.

Keep in mind that this will vary depending on where you live. Certain jurisdictions have different standards and rules that you’ll want to follow, so be sure to consult with a local plumber before attempting to DIY install anything.

Shower Pipe Size

We published an article covering shower pipe size recently, and it’s quite short, so give it a read. If you can’t be bothered, here are the (somehow even shorter) notes:

  1. The standard shower pipe size in the UK is 15mm.
  2. Other pipework (toilet waste line) in your bathroom will most likely be 22 mm.
  3. Irish pipe size varies slightly. Irish standards use 14.7 mm and 21 mm for shower and waste line pipe size.
  4. A tank or cylinder heater requires a 22 mm pipe, otherwise it won’t provide a good flow rate.
  5. A combi/boiler needs 15 mm to ensure proper pressure and flow rate.

Reset Mira Electric Shower, Mira Advance Shower Beeping

This is a somewhat common issue that people have trouble with. If you have a Mira Advance Thermostatic/Electric shower, you’ll eventually need to reset it. While instructions can be found for this in the owner’s guide, we’ll give you a quick guide on how to reset it. Among other potential reasons to reset your shower are:

  • High-pitched whistle coming from shower
  • Shower is beeping
  • Red lights are lit up at the bottom
  • WATER SUPPLY and/or RESET error codes
  • Water has made its way into the actual shower unit.

To reset a Mira electric shower, do the following:

  1. Turn off the electric supply to the shower
  2. Crank up the temperature to a relatively low setting, like 5 or 6.
  3. Turn on the electric supply to the shower.
  4. Press the start and flow buttons together, within 30 seconds of the shower coming on.
  5. When it beeps once, release the start button.
  6. On the second beep, release the flow button.
  7. Next, leave the shower until it turns itself off. This should take roughly 5 minutes.
  8. If your issue persists, you’ll need a tech to examine your circuit board. It’s likely an electrical fault in your circuitboard or another part of the shower’s hardware.

Final Thoughts

That was a bunch of little answers that we conglomerated for you in one, easy to use, little list. Trust me – none of these will be regularly-used knowledge (unless you’re a plumber), but it’s all good to know. Each of these is an important, little bit of information that’s surprisingly hard to find online, and now you’ve got it all in one, convenient place! When you’re installing your next shower, be sure to refer to DreamyHome (and our host of related articles) for any of your questions.

And if you’re ever unsure of what you’re reading or feel that you need advice, please – call a plumber. It’s their job to know the specifics of your local area’s plumbing, and they’ll likely be able to answer any frustratingly hard to find little questions you may have.

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About the Author Ethan Hauck