My indirect heat water tank not getting hot water from the circulator pump to heat the water tank when it is called from the theromsat. Please help.

Electric water heaters need the power turned off when servicing the hot water system or risk burning out the heating elements. Water heater tank water level must be filled before restoring power to the heating elements.
The closed circuit water pump also needs the power turned off while servicing the loop or risk pump seal damage.
Loop pump needs water to work, air pockets trapped in the pump will avoid water circulation.
Please provide better information for a better answer.

Pump circulating heated water to the tank? Set the temp adjustment on the tank?

Hello Melville,

That is a VERY NICE FEATURE designed to
give you INSTANT HOT WATER every-time
you use the faucet...

If it is done well it DOES NOT sound like the water
is running all the time... (big if).

The really wonderful part... HERE in CALIFORNIA
where WE have INFRASTRUCTURE to support
15 MILLION ... and we approximate 40 MILLION thirsty
residents... It is NICE to know A FEW responsible people
like you ARE NOT WASTING Gallons of water at EACH USAGE...
waiting for the water to get warm.

You ALREADY have instant warm water at your finger-tips because of your circulating pump.

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Usually toilets do not require hot water.
Is the plumbing divided into hot and cold water pipes?
If toilets are hooked to hot water, how many flushes and how many gallons per flush per day.
What is the expected consumption per each worker?
What is the latitude from equator, and expected solar input. Further north, and hazy atmosphere reduce input. Beijing has smog I believe.
How often is the solar panel going to cleaned of smog and dirt for maximum collection?
If the area has hard water, then the entire system is prone to sediment build-up and failure unless water is artificially softened.
Solar water heater temperatures can exceed 180 degrees at times. This temperature will damage storage tank that is not made for that temperature.
Most solar water heater systems have pressure regulating valve and expansion tank to accommodate occasional high temperature and pressure.

A good fellow to contact might be at following website:
http://www.builditsolar.com/Projects/WaterHeating/water_heating.htm

Solar collectors are usually connected to a circulating pump, and then the heated water is stored in a tank.
The pump circulates water continually from solar collectors through a storage tank.
This type of system would use ordinary tank-type water heater for storage.
Most of these systems also utilize a back-up heating element inside the tank.

More complicated systems circulate special liquid through spiral tubes inside the water heater.
This type of heater would be an indirect water heater.
Indirect heaters are used for solar collectors, and used with boilers, or any outside heat source.
http://www.bockwaterheaters.com/Products/products_coil_tank_water_heaters.html
http://www.hotwater.com/products/residential/cirrex_solar.html
http://waterheatertimer.org/images/solar-water-heaters-on-roof_lbiRv_5784111-500x282.jpg

Hi,
In most cases problems with the circulator pump boil down to two problems.
The most common is air in the lines causing an air lock.
The next problem is that the pump gets stuck and is not running even though itmay be hot and seem to be running. In this cause the pump can sometimes betaken apart, cleaned and it will work, but usually it needs to be replaced.

Here is a tip that I wrote that will explain circulator pump problems in moredetail.

Heating Circulating Water Pump Problems

heatman101

Hi,

Need to know more about the system... zone valves ot pumps....indirect hot water tank or internal coil??

Here is a tip that I wrote that may shed some light on things for you...

In most cases problems with the circulator pump boil down to two problems.
The most common is air in the lines causing an air lock.
The next problem is that the pump gets stuck and is not running even though it may be hot and seem to be running. In this cause the pump can sometimes be taken apart, cleaned and it will work, but usually it needs to be replaced.

Here is a tip that I wrote that will explain circulator pump problems in more detail.

Heating Circulating Water Pump Problems

heatman101

If you are using more than one heat source you will have 1 more pump than the heat source pumps Main pump = SYSTEM pump pumps through the indirect hot water system and back into itself. This is the system loop. The other two boilers tee into this loop upstream of the indirect tank, downstream of the SYSTEM pump. The cold water return to each boiler tees into the system loop next to and upstream of where the hot water for that boiler tees into the system the loop. The oil boiler will have its own pump on its return line from the sytem loop and the solid fuel boiler will have its own pump. When any boiler fires, it turns on its own pump AND the system pump. If you want a drawing email me [email protected] send a fax number and I'll fax you a drawing.

Hi,
The problem is probably with the circulator pump or the zone valve, which ever way your water circulating from the boiler is controled.
The water needs to be moved through the boiler and the coils in the Hot water maker to heat water. If this is not happening then no water will be heated.
Check for power and then is the pump is running or the zone valve opening.
I hope that this will help you to solve your problem!

Thanks for using Fixya!!

Heatman101

The vent pipe should be in front of the pump so that the pump pushes towards the vent pipe NOT sucks from it. I hope this vent pipe is part of the heating system and not of the hot water
Pumps like to push not pull and therefore it is better if the pump is located further down - say at the bottom of the cylinder or lower.
With an indirect cylinder, the hot water & heating are separate circuits and are not and must not be interconnected. You will need a separate pump for the hot water which should be taken from the hot pipe coming out of the cylinder. You may get vacuation in the cylinder - then you will need an Essex or similar valve to replace the hot water outlet connection
By the way - The pressure at any hot tap is directly related to the height difference between the tap and the header tank in the loft [thus a shower downstairs feels stronger than one upstairs]
[email protected]