My new joven pump for my mom house don't have switch to off the pump. Then older Centon have it.

Don't have to on / off, it will switch on automatically Every time you on the water heater. It apply for all build in pump.

The older Centon can adjust pump speed, or turn off the pump it not required. is just a manual knob.

Get a reputable product, and a good installer. Don't cheap on product and installation even is for rent. Your tenant is still human being.

Whatever, water heater is not expensive please don't buy a cheap quality water heater and engage some cheap not trained to install. A good brand is only like RM 150-200 difference. Life is definitely worth more than that. Even is for rented.

I install all the instant water heater myself, and I can say my quality of work are much better than many contractors.

Is only install, no removal of storage. You need to pay the removal. Instant water heater usually they can help remove because is easy job.

If you have the tank type, you have a mixer right? Why downgrade to Instant? Storage tank are much better and safer too.

Water pressure is incoming problem right? If you spend money to remove, must well spend money to replace it. The amount of money you spend to remove may be only slightly less than installing one.

To disconnect storage heater, you need to also get plumber to disconnect all the old piping. You can't leave the water inside the storage stagnant for too long. The incoming and outgoing piping need to be drain and seal.

There is no free lunch in this world. Ask your friend for any good plumber. Sorry I don't like to recommend / introduce people in forum. Too many problem already.

I notice the newer WH with build in pump do not have speed control and on/off for pump. Saw few difference model & brands don't have. You may have a old packing, but new design unit.

If they are the same batch this company QC is having big problem.... If difference batch number can be design update. Let see what answer you get from the shop.

This post has been edited by weikee: Jun 3 2014, 02:36 PM

You forget to add AC to DC conversion, this also will generate noise, added complexity of the circuits making it another potential problem.

Noise as in electrical noise.

So far 3 units of build in pump I used all allow pump to run while the heating element is switch off. The newer Joven Instant water heater I am using now don't allow the pump to be switch on/off and can't control pump speed.

Latest is using Joven. Previous two model was Centon. This water heater with build in pump really not lasting. At most I use the first generation Centon for 5 years.

I install myself.

Heating element is still operate the same since the first come into marker. All the same.

Want more efficient use Gas heater. For more budget get Solar, but ROI is close to 0%

This concept is been around for many years. Singapore promoting it very aggressive and die off. There are some challenges in the technical issue. One I remember was the piping that complicate things and cost. Another is when A/C running it for long hours after heated up the all water what happen? Cold the water? If they already address the earlier challenge and price are reasonable it will be a good future use.

Expected to be slow flow, because the flow rate are low. If you need higher flow rate it need external pump, or your water heater installed in ground floor. Than again with good flow rate you will have problem with warming the water especially in rainy day.

To really enjoy hot water rain shower, is either storage heated, Solar, Gas, or high power instant water heater.

External pump is central pump system need to install just after the Tank in your roof.

You need to confirm your current water heater support external pump. The joven I am using already state on the box, cannot use external pump.

This post has been edited by weikee: Jun 16 2014, 02:08 PM

The one I am using can't be off. Lucky my mom house don't have centralize pump.

Maybe can try cut the wires inside if you know how is work. Beware of safety and warranty. I will not held responsibility.