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    Bluesmartie83's Avatar
    Bluesmartie83 Posts: 3, Reputation: 1
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    #1

    Jan 10, 2015, 03:04 AM
    Hot water issue
    Hi, we have just moved home and have discovered that the hot water seems temperamental at best! If you run the water slowly then it heats up. If you run the water fast then it turns cold. This is a nightmare when we want to run a bath! We have a combi boiler which works OK for the heating! Any help would be great.
    parttime's Avatar
    parttime Posts: 1,440, Reputation: 113
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    #2

    Jan 10, 2015, 04:53 AM
    Hi Bluesmartie83 and welcome, is this just an issue in the bath? Or is it at all fixtures?
    Bluesmartie83's Avatar
    Bluesmartie83 Posts: 3, Reputation: 1
    New Member
    		  
    #3

    Jan 10, 2015, 05:09 AM
    Yes the previous owner just said he didn't take baths and left the water to run slowly to get a sink full downstairs!
    Milo Dolezal's Avatar
    Milo Dolezal Posts: 7,192, Reputation: 523
    Plumbing Expert
    		  
    #4

    Jan 10, 2015, 12:40 PM
    Do you have Tankless Hot water heater in your new house ?

    Back to you

    Milo
    Bluesmartie83's Avatar
    Bluesmartie83 Posts: 3, Reputation: 1
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    #5

    Jan 10, 2015, 12:41 PM
    Yes no water tank.
    Milo Dolezal's Avatar
    Milo Dolezal Posts: 7,192, Reputation: 523
    Plumbing Expert
    		  
    #6

    Jan 10, 2015, 01:23 PM
    With presence of Tankless Hot Water heater, the symptoms you describe are most-likely related to undersized gas pipe going to the water heater. If demand for hot water is high, and there is not enough gas going to the heater, heater will slow down water flow though the heater, in attempt to produce hot water as set on the thermostat.

    Look at your tankless water heater. See how far it is from the gas meter, and if possible, see how big gas pipe goes from gas meter to the tankless. Let me know these two values

    Back to you

    Milo
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