Water heating connect

Sprinter 1 cup

Forum Member
Non return vales how to use and where to place @ cost £2 to £25. inline non return vales from tank to taps via pump, cold and hot water. 12mm pipe
So non return vales x how many 2, 3 ,4 or5. 2vales 1 on each tank ?
4 vales after pumps in each line ? 4 vales 4 after pumps .ie 2 hot 2 cold
Five vales used .3 on hot water 2 on cold water at taps.? 2 after pump one at tank.
I dont know where to put them for a better mixture ! Im useing house hold mix tapes ie 15mm mono mixer taps at sink and shower.
1 pump pressured system. Or 2 pumps and if 2 ? What best paces for them in line ? for hot water at 70 degrees. Make and modle please. Pics and link are better for me for hot water as have cold pump.
TIA
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SquirrellCook

Forum Member
I normally only use two. One on the hot side of the water eberspacher to stop reverse flow when the engine is running. The other one is on the cold feed to the calorifier. The idea is to stop heat back feeding the cold supply.
 

Squiffy

Forum Member
Little bit confused here, unless I've missed the point. I use pumps with built in non return such as Shurflo trail king, unless you use a submersible rotary I don't see the point of using non return valves. I also use household mixer taps and have never had a problem with cold water feeding back to the tank or back to the hot water tank? Phil 🤔

P.s. The system pressure with the pump turned off also stays pressurised for weeks too, so I can return to the van after its been unused for a couple of weeks, open the tap and it still flows till the pressure in the system falls to nil.
 
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SquirrellCook

Forum Member
The idea for the non-return valve on the cold feed to the hot water tank is to reduce heat being lost into the cold pipe. I'm sceptical about this, but also not sad enough to prove it. For the sake of a cheap valve I see no harm in it. Just remember you will also need an expansion vessel in the hot circuit.
 

wildebus

Forum Member
Out of possible interest, I got my expansion vessel from Screwfix along with the Heater - and then I found the same Expansion Vessel at HALF the price on Amazon. So sometimes the most unlikely sources can work out cheapest :)

(just had a look - it is 60p now than 2 years ago and the heater itself might be cheaper than Screwfix as well now?)
 

Sprinter 1 cup

Forum Member
Right so expansion vessel and shuffro water pump on cold will make a non return ish and keep the system pressurised. Lovley. Thanks

Will all pumps take 80 , 90 degree water or are they different ?.
Just brought a 20 ltr tank new £10.00 from properjob .but how to get a 22mm nut on inside.
 

Squiffy

Forum Member
Right so expansion vessel and shuffro water pump on cold will make a non return ish and keep the system pressurised. Lovley. Thanks

Will all pumps take 80 , 90 degree water or are they different ?.
Just brought a 20 ltr tank new £10.00 from properjob .but how to get a 22mm nut on inside.
The pump should only pick up and deliver cold water to the cold taps and hot water tank. The hot water tank is under pressure from the pump, when the hot tap is opened hot water will flow from the top of the tank to the open hot tap, whilst the pump will replace the hot water with cold at which time the heater will start heating the water again, ready for when more hot water is required.
As for the 22mm nut, is there not a service access to reach inside or at least a cap that will allow a 22mm nut to enter the inside? Phil
 

Sprinter 1 cup

Forum Member
No it opening is for fule nozzles. Got the 2 x 15mm barbed on with a longer stick taped to the ring spanner. So they are tight, but the bulkhead 12mm pipe fitting is a bugger.
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Sprinter 1 cup

Forum Member
Temp probe stops circulating pump. so nothing but a 120derees it will drain back to empty tank. I think that's how it works, I don't know ! ?.. my thinking was it runs empty . I'll call them
Thanks
 

Sprinter 1 cup

Forum Member
So the black male 12mm to 15mm work as is . Lovely. Plastic to metal. The grey 12 mm plastic female leak like a sciv e at metal 15mm end, so put pdf tape on 15mm metal tap inputs and still leek under pressure when water pump is on!. The nut walls deformed when tightened on the grey plastic. 12mm fitting without heat .
Is there a better fitting for the female metal to plastic ? As I dont want a to put jubilee clips on 15 mm male end of mixer taps to hold grey plastic nut connection water tight.
Cant sleep as I wont stand water leaks
This is a 12mm push fit system and the sink has great water pressure with male connection.
Its the shower that both sides leak.
 
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SquirrellCook

Forum Member
I think this looks like one of those job where you need to be cool, calm and collected. Where you have a rigid pipe into a push fit socket, chamfer the pipe so it doesn't damage the O ring. If you rigid pipe is too soft there are inserts to put inside the pipe.
With the threaded fasteners, the thread should not be making the seal. So you shouldn't need PTFE tape. Just make sure each part has a compatible seat.
Sometimes if your crafty and you have incompatible seats you can use a fibre washer, O ring or even and olive to make the seal.

We're spoilt having a machine shop at hand, I just ask Anita to machine an adapter to make it work. :)
 

Sprinter 1 cup

Forum Member
The 12mm red and blue pipe sills well it the other end, nut end, ,!.on grey. Are they bsf or 15 mm I dont know.
The pig tails are cheap mite just buy those and fit male.
Will try more pdf tape on female but they should work out of box the lazy f#ckers.
 

Nikita2

Forum Member
Non return vales how to use and where to place @ cost £2 to £25. inline non return vales from tank to taps via pump, cold and hot water. 12mm pipe
So non return vales x how many 2, 3 ,4 or5. 2vales 1 on each tank ?
4 vales after pumps in each line ? 4 vales 4 after pumps .ie 2 hot 2 cold
Five vales used .3 on hot water 2 on cold water at taps.? 2 after pump one at tank.
I dont know where to put them for a better mixture ! Im useing house hold mix tapes ie 15mm mono mixer taps at sink and shower.
1 pump pressured system. Or 2 pumps and if 2 ? What https://zumbaliciouscrew.com/en/zumba-on-demand/ best paces for them in line ? for hot water at 70 degrees. Make and modle please. Pics and link are better for me for hot water as have cold pump.
TIA
View attachment 3852
It seems like you're looking for guidance on installing non-return valves in a water system with pumps. Here are some general recommendations:

Non-Return Valve Basics:
Function Non-return valves (check valves) prevent the backflow of water, maintaining a one-way flow.
Placement: Install non-return valves in areas where backflow is a concern, typically after the pump and before outlets.
Single Pump System:
Cold Water: Place a non-return valve after the cold water pump to prevent water from flowing back into the tank.
Hot Water: Similarly, place a non-return valve after the hot water pump.
Multiple Pump System:
Cold Water: Install a non-return valve after each cold water pump to prevent backflow into the tank.
Hot Water: Same for hot water pumps; each should have a non-return valve.
Taps (Mixers):
Cold Water: Consider placing a non-return valve just before the mixer tap.
Hot Water: Similarly, install a non-return valve just before the hot water enters the mixer tap.
Number of Valves:
- Cold Water: At least two non-return valves (one after the pump, one at the tap).
- Hot Water: At least two as well (one after the pump, one at the hot water tap).
Temperature:
- For Hot Water: Use valves rated for high-temperature applications (e.g., brass or stainless steel construction).
- Brands and Models: Consider well-known brands like Watts, Apollo, or similar.
Recommendations:
- Consult a Professional: If unsure, consult with a plumber or a professional in water systems.
- System Design: The placement may depend on your system design, and it's crucial to consider the flow dynamics.
Important Note:
Remember, the exact placement might vary based on your specific system, so it's advisable to consult with a professional or the manufacturer of your pump and valves. They can provide guidance tailored to your setup.

For images and specific product recommendations, it's best to check with local suppliers, plumbing stores, or online retailers based on your location, as product availability can vary.
 

SquirrellCook

Forum Member
All those non return valves would be asking for trouble in very cold weather.
Unless you pressurise the system with air it would almost impossible to clear the pipes from water.

BTW, I expect it's installed now.

Mark
 

Squiffy

Forum Member
Quite frankly I've never had the need for non return valves, all systems that I have installed have been with a pressurised system and out of five that have been installed never has water gone back to the tank the pump valves have been more than efficient 🤷‍♂️ as Mark says with all these no returns there is room for more problems and Emptying the system would be a nightmare. Phil
 

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