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negative head pumps tend to come in more expensive than the positive head pumps but the singles should be less expensive than the twins.

and this is where i step in.... You could pump the hot only to give you a balanced pressure with a single negative head pump that matches your cold mains pressure as close as you can. The reason for the negative head pump is so that the flow switches (in a positive head pump) are not...

hi which pump have you got? make and model

Altech pumps tend to be shower pumps? any chance of a picture.

it would do yes, the pumps would need to have their own dedicated feeds from the cold tank, which you have and the hot water cylinder, which you have not.

shower pumps are usually connected to a shower and CH pumps usually connected to the CH system..... .....or is this just getting daft now lol :wink:

....and CH pumps are usually rigid piped up and shower pumps tend to have flexible/anti vibration couplers. cheers

Any chance of a picture?

I cant really be seen to be advertising but a 3 bar negative head pump would be ideal in your situation. A quick google search of my name minus the first two letters and negative head pumps should sort you out :wink: Just one point to mention is that the negative head pumps are not a direct...

Good afternoon, with the steam type shower pods, they tend to be quite restrictive and dont allow enough natural flow to initiate the pump or can cause the flow switch to lift and drop causing the pulsing. Usually we would recommend a negative head pump for that type of unit. It may be...

Im a plumber not a physicist, obviously a cut and paste. Its a forum for information and that is information on thermodynamics in a thread for thermodynamics. People that read will be able to use the parts that they want and disregard the parts they dont want. It makes an interesting read thats...

Thermodynamics is the branch of natural science concerned with heat and its relation to other forms of energy and work. It defines macroscopic variables (such as temperature, internal energy, entropy, and pressure) that describe average properties of material bodies and radiation, and explains...

be careful just turning the thermostatic valve off as it may still pop open while your working on it - Use the decorators cap that came with the TRV

could pump the hot??

I would be fairly careful about fitting the pump under the bath as it can be difficult to get dedicated feeds from the cylinder and cold water cistern. Most people tend to tee them in under the bath which usually isn't the correct way to do it. You can also be restricted as to keep the hoses...

Good morning, If you have mains pressure to one side of a mixer and you want to pump hot to the other side you would need to install a negative head pump that matches your mains pressure as close as you can. The reason for this is that if you have a positive head pump and mains cold, you will...

Hmmmm, cheers, makes interesting reading....

good afternoon, most pumps will require a certain amount of natural flow to lift a flow switch and keep it lifted. depending on the manufacturer of the pump there should be minimum flow rate - if it drops below this the floats will lift up and down causing this puling effect. it could...

Afternoon all, Just a quick question regarding flexible hoses to basin taps, kitchen taps etc. There seems to be some concerns about this type of hose being used to supply water to these fittings as there could be a Legionella and Legionnaires' disease risk associated with them. One huge...

All domestic shower pumps would need to be below the cold water cistern to ensure they are constantly flood with water during use to prevent cavitation on the impellers. Negative or positive head would be determined where the highest point in the pipework is after the pump/the shower head...