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seen Sep 17 '13 at 23:27

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comment What could cause a shower to give warm water for a few seconds, then only cold water?
Added edit per feedback from OP.
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revised What could cause a shower to give warm water for a few seconds, then only cold water?
Added illustration of pre-mixing configuration, per request in (now rejected) edit from OP.
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revised What could cause a shower to give warm water for a few seconds, then only cold water?
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answered What could cause a shower to give warm water for a few seconds, then only cold water?
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comment What could cause a shower to give warm water for a few seconds, then only cold water?
I'm guessing that initial burst of warm water only occurs when you test this faucet multiple times in a row. If you leave the faucet off for a few hours the hot water supply pipe should cool since the hot water is not flowing through the pipe and the unmoving water/pipe will slowly radiate and lose temperature. If you turn the faucet back on after this cooling period does the water even get warm?
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