poor hot water flow

[llahuts3791]

Hi,

I have quite a poor hot water flow throughout my new property (except one hot tap downstairs), is there anyway to boost my hot water flow as it draws off the hot water cylinder, so all my hot taps will flow better.

I have a Gloworm boiler (not combi), 2 cold water tanks and a hot water cylinder, a 3 port valve (already changed this), and a heating pump.

Many thanks,

 

[pannierstan]

Its either the header tanks that are not high enough or the diameter of the DHW draw off which is undersized.

Stan

 

[llahuts3791]

Its either the header tanks that are not high enough or the diameter of the DHW draw off which is undersized.

Stan

The hot water draw off is in 22mm, and the cylinder is in the airing cupboard, not the loft so yes this may be the case. I don't really want to go to the expense of moving everything into the loft, is there no pump that can be used on the 22mm draw off to boost all the hot water points?

thanks again

 

[pannierstan]

As far as you can see it is! What about under the floors.

Main thing to do to improve gravity DHW is to raise the head of water if flow is not good enough.

Not to sure on booster pumps. Perhaps someone else can tell you

Stan

 

[sooey]

It's possible that your outlets (except for the downstairs tap) have had high pressure fittings put on, and so will not work properly on your low pressure system. It has nothing to do with your heating pump or 3 port valve. Is it a brand new house? and if not does it look as though the previous owners have done the bathroom up prior to selling?

 

[ChrisR]

Check that the slow taps haven't got unscrewable ends to the spouts. These can trap scale etc.

 

[Agile]

You should be able to use a shower pump to improve the pressure.

However you are likely to need a negative head version.

Tony

 

[llahuts3791]

Scoured the net, would a Grundfos UPA 15-90 Domestic Water Boosting Pump work?

The house isn't a new one, the bathroom has the worse flow (nearest to the cylinder).

Any help on the "Grundfos UPA 15-90 Domestic Water Boosting Pump" would be appreciated. I would be intending to fit this on the hot water draw off so it supplies the whole house.

Thanks

 

[Agile]

Hi, I have quite a poor hot water flow throughout my new property ,

So you have changed you mind about it being a new property then?

The 15-90 is unlikely to start up automatically with a poor flow rate. Although you could always leave it on continuously I suppose.

Tony

 

[sambotc]

OP it's not the hot water cylinder that need's raising, but the CWS tank in the loft (you mention you have 2 in loft, it's the biger one)

Your tap downstairs is ok so it would indicate this is the problem)

It would be far less problematic to have a go at raising this tank if possible IMO

HTH Sam

 

[Softus]

As pannierstan said, way back, it's either the head or a constriction.

Measure the vertical distance from the base of the large cistern in the loft to the lowest of the hot taps that is giving poor flow. If this is less than one metre then the head is insufficient.

If you're up for it, then cut into, or uncouple, the pipework coming from the top of the cylinder (having shut off the cold feed), then measure the flow that you can get directly from the cylinder. If it's more than you're getting from a tap at a similar level, then this indicates a probable constriction.

 

[llahuts3791]

Hi, I have quite a poor hot water flow throughout my new property ,

So you have changed you mind about it being a new property then?

Tony

Sorry, meant the property was new to me. Thanks for all your help, i will raise the tank into the loft as it's currently in the airing cupboard.

 

[daveyboys]

Hi, I have quite a poor hot water flow throughout my new property ,

So you have changed you mind about it being a new property then?

Tony

Sorry, i'm not the best at explaining things, meant the property was new to me. Thanks for all your help, i will raise the cold water tank into the loft as it's currently in the airing cupboard with the cylinder, obviously i will leave the cylinder where it is.