网上google的，大家可以留意：Not enough hot water
This is caused by any of:
1、 thermostat set too low. This can be a problem with new replacement elements, which often have stats that wont go as high as older ones, but sometimes the tank size can require a higher temp to have enough HW capacity.
2、 replacement element too short
3、 For curved element systems, replacement element is mounted the wrong way up, with the curved end pointing up instead of down
4、 For 2 element systems, bottom element not working
5、 With heat banks, a badly scaled exchanger reduces rate of heat throughput, but not capacity. The tell tale sign is that fast flowing HW is not hot enough, but slow the flow down and the temperature is restored.
6、 Insufficient HW system capacity for new appliances, eg power shower
Solutions:
1. Turn up stat. If it won't go high enough, it may be possible to wire it out of circuit and replace with an external stat, but a secondary non-resetting temperature cutout is also now mandated.
2. Replace the replacement element with the correct longer size
3. Refit element with curved end down
4. Troubleshoot lower element & its associated parts
5. Replace or descale exchanger. Consider scale prevention before the exchanger.
6. Applying as many options in Increase Hot Water Capacity as possible may be enough. Turn down shower pumping rate. If these measures aren't enough, a larger HW cylinder will be needed.
2 Element Systems
This variant has a small upper element to give a relatively small volume of hot water which heats faster, as well as the main longer element that produces enough for a shower or bath.作者: kingscat 时间: 2010-9-28 18:28:55