Litlos

I have the same problem with stop start hot water in the shower, mine is due to insufficient flow as the unit is oversized. The way I get around it is to open the hand basin tap as well as the shower to give enough flow. You may also have a water saver type shower head, take the shower head off and see if this makes the unit run properly. Another trick is to lower the set temperature so adding less cold will mean higher flow through the unit. There may also be flow adjust valves in the unit, if new you should have or be able to get a copy of the instructions. My unit is old (rental apartment) and no instruction, however worked it out that the unit is designed for a high flow, not the little bit I am trying to use in the shower.

For the pump it sounds like it could be plumbed in backwards, I have seen this type of effect before if it is a centrifical pump.

If you are concerned about power spikes have a think about a surge protector. A UPS is designed to provide backup power and may or may not provide surge protection depending on the design. A surge protector is designed to eliminate surge/spikes/lightning effects. A good brand is Belkin and they are availble at Big C and Invadeit. It is importantfor surge protection using either method to have the power point supplying the power earthed if possible. A good 4 point surge protector type power board is about 500 Baht. If you are really worried then have both a surge protector and a UPS.

I use my AIS mobile to call CAT pin phone, is a free call on 1544. The CAT pin phone to UK is 2 baht per minute to landline, 6 baht per minute to mobile. You can buy the CAT cards at some 7/11 and Family Mart. There is a website called Thaitelephone where you can buy them online after setting up an account and they are called Thailand calling Card.. I have been using the CAT cards for about 6 years and the quality is good 99% of the time.