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I have a small tankless water heater and the flow from my bathtub spout is too strong and the water will not get hot. How can I reduce the flow in just the bathtub spout?

  • You can add a flow restrictor to the tub pipe outlet, this won't work if you have a showerhead that uses the tub spout diverter valve. – Ed Beal Jan 10 at 23:12
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    your question makes no sense .... there is already a "flow restrictor" on your tub spout .... just don't open it fully – jsotola Jan 11 at 2:07
  • @jsotola - see the above comment about shower heads as to why. But actually if so, fill the tub with the shower head (ideally a wand hanging down). Perhaps half way in between a setting, so that the flow really sucks, or mostly shut off if it has that setting. – Mazura Jan 12 at 2:41
  • @Mazura, the "flow restrictor" I am talking about, is the valve that is used to turn the water on/off .... simply turn it on partially ....... that is why the question makes no sense, unless the OP has failed to provide all of the information ..... either way, the question is actually unclear .... downvoting – jsotola Jan 12 at 2:52
  • .... oh. Yeah, use that one.... But some are full cold +/- full hot... ? (especially with a shower). With certain types of single knob valves this can be a problem – Mazura Jan 12 at 2:53
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Get a shut off for the shower head (or one that shuts off) and try jsotola's idea: just don't open the tub spout fully. A shower head is a lot easier to take off than a tub spout (anything but that - you'd have to, to put an aerator).

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I suggest you to add an aereator (aka economizer) to your tub faucet: it will, about halve, the flow used at a reasonable price.

If your water heater is smaller than 24 kW you should get a bigger one. (24kW allows 10L/min flow @30K temperature's jump) that is pretty low flow and not-very-hot water, if you live in hot regions it may be good (cold water hotter than 15°)

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