Water Pressure

[Pormax]

Hi any experts on how to increase water pressure to house. I have a deep well pump which worked ok but the problem I had was that the three (3) water heaters I have (2 for bathrooms, sink and showers and 1 in kitchen for sink had rather low pressure for the hot water, cold was ok.. Not a problem with sinks but the showers would get hot then go cold and then hot then cold again. I thought it might be that I do not have sufficient pressure as someone said the good pressure for the hot water heaters was essential. So I waited until the builder had put up my water tank and then fitted a Mitsubishi water pressure pump but instead of the pressure being better it is slightly worse. The Mitsubishi water pump is only 150 watts but they do a 240 watt. Will this help? I don't want to spend out more money to find no improvement. Anyone there with experience of water pumps and hot water.

[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.

[kamalabob2]

If you go to an independent "pump and tank" shop you can have a reasonable priced PRESSURE TANK installed. You will save electricity, not have your pump cycle on every time you turn on a tap, and you will have excellent water pressure for electric water heaters, even on a 2nd floor. If you buy such an item form an independent store they might have better knowledge of the installation, AFTER THE SALES service, and lower prices due to lower overhead.

Like any product in Thailand, different types and different grades of pressure tanks, but if you are not DRINKING the water it opens up options.

The attached two photos are not my house, but a friend's house who has a slick stainless steel pressure tank, I believe more costly than the steel tank I have enjoyed for over 3 years at our home. We never run out of water pressure in our two story home with a 500 liter pressure tank. The water pump might briefly come on twice a day for a short period to perhaps fill the pressure tank.

[JAS21]

Hi..read this thread Especially my comments in post No 3.....they are correct. The pressure tank integral with the pump must be empty for the system to work correctly!!

Unless I misunderstand your problem......................

It should be easy to sort........your deep well pump should supply the house for most purposes. You should have a tank supplying a WP type pump...not and EP.. and the pump teed in as shown below.

Your supply from the deep well pump should be the vertical pipe coming out of the red tiles by the wall, the water then goes through the two brass non return valves and out, to the house down through the pipe that again goes through the red tiles.

The tank is supplied from the deep well pump through the first non return valve and a float valve at the tank.

The pump Tees into the house supply via the non return valve that you can just see (behind the pump).

The pump will cut in and cut out as required and it will maintain a fairly constant pressure..within limits..and will be fine for a shower or showers.

Ignore all the other pipework as it’s for the garden watering system.

I didn't fit a pump inlet valve, but I have to drain the tank if I want to change the pump....

Hope this helps.....somewhere I have seen a simplified drawing of a standard installation...if I find it I'll post.

[JAS21]

You might find the circuit you want in post No5 and No28 of

Edited July 21, 2011 by JAS21