Currently renovating/rebuilding my house but I can't decide between this two. Here're some questions,

In two stories terrace house, (first floor 2 bathrooms, g floor 1 bathroom) , 440gallon water tank is on first floor roof, anyone knows how well usually the water pressure be on the first floor? Good enough for rain shower heaters?

At my old house, I realized heater with pump does not work probably if the main water pressure is low, but I guess it depends on the brands.

Someone suggested me to get the heater with pump first, if the pressure is not good then install the main pump but I am afraid I will waste more money because heater with pump is more expensive, once we have main pump there is no point anymore.

Are heater with pump less durable compared to those without pumps?

What about the electricity? Will the main pump use more electricity compared to heater w/ pump?

Thanks in advance everyone!

This post has been edited by Kellicros: Apr 7 2018, 02:25 PM

There is spec on heater pump on how low inlet pressure can be. Many known brand has no problem I believe.

My house all shower are direct supply just as kitchen sink. It is originally from developer. The pump at the tank is good because you will have good pressure overall. How powerful the tank depends on how many tap. Low power might not produce good pressure if many taps are opened at the same time.

Inverter type will provide constant pressure and no water jetting effect. Remember that good water pressure means more wastage because more waste water

If you just need for shower, then just go for heater with pump, but I think the sink tap also low pressure right? This is my problem too I was planning for tank pump years ago until now

Pump would not has significant increase on electricity I believe.

If you like a good shower or want to use a rain shower then go for separate pump and storage heater.

Instant heaters cannot give you a good flow rate. It’s not only about pressure but also important is the flow rate.

Thanks for the info, guys.

The heater w/ pump at my old house doesn't work properly, technician came and said there is not enough water pressure, then he gave me a strong magnet to "activate" the pump manually, very troublesome lol, but I guess it is it a known issue.

Also another thing I am concerned, if there is a leakage in my piping will the water start bursting out because the tank pump is "activated"? Or is there a minimum water flow required for it to be activated?

I will need good pressure for the taps and bidet as well(I actually have a third toilet on first floor that only houses a WC and Sink), so tank pump is a better option right?

I am aware of the storage heater but since I only need the heater for shower and not on taps wouldn't it be more wise to use regular heater? It will also cost more to install hot pipes right?

This post has been edited by Kellicros: Apr 7 2018, 03:05 PM

Just as idoblu suggest.

Plumbing a hot water and cold water pipe for all the bathroom. Install mixer and rain shower head.

Centralize a hot water tank type.

Use 1 main water pump for all the bathroom. (even other tap if require).

You might need to increase the water tank size.

1. check if there is a bypass tank piping( ie a connection between water supply and after the tank(bypassing the tank).
2. if 2 available, then just open the bypass la. make sure there is a checkvalve that prevent backflow into tank.
3. check pressure adequate for shower or not.

good luck.

Instant water heater with pump just can't compare with separate pump with storage/gas/solar heater. The water pressure and hot water are just miles different.

If just want normal shower with average (sometime low) water pressure, instant heater will be OK.

When I switch off my central pump, the 1st floor water pressure really low.

This post has been edited by weikee: Apr 7 2018, 05:09 PM

Do you have outdoor filter with sand type or membrane type ?
I read in other thread that sand type may cause low water pressure when using rain shower.

Washroom use water from tank, unless is mod by house owner.

I summarize your questions into 4
1) Usually not good enough due to low headroom.
2) Heater with pump can definitely increase the pressure. But whether it reach your desire pressure or not is another matter.
3) Usually when there is more components, the tendency of breaking down is higher.
4) Yes, it will cost more. But the amount is not significant.

If the water is come from the roof tank, then i has nothing to do with the outdoor filter.