Water pump

[Sprinter 1 cup]

What sort of pump is ypurs? Do you turn on and off?

This is no combi this is 2 systems with good pressure on both all taps. 20 ltrs of constant hot water. A relay could connect both pumps 10 amps each, but I use fuses at this time. As I still building van. It will have upto 50ltr hot from solar afternoon s electric.
Last year has been the way for over 10 years. This is tomorrow.

 

[susarich]

Would this work?

CARAVAN MOTORHOME 12V 30PSI 5.3LPM FLOJET WATER PUMP TRUMA WATER SYSTEM NEXT DAY | eBay

Find many great new & used options and get the best deals for CARAVAN MOTORHOME 12V 30PSI 5.3LPM FLOJET WATER PUMP TRUMA WATER SYSTEM NEXT DAY at the best online prices at eBay! Free delivery for many products.

www.ebay.co.uk

 

[susarich]

On another note where is the best place to buy water pipe ?

 

[SquirrellCook]

On another note where is the best place to buy water pipe ?

I used something like this on the Murky build due to it's frost tolerance.

Flomasta Push-Fit PE-X Barrier Pipe 15mm x 25m White - Screwfix

Order online at Screwfix.com. Suitable for all plumbing and heating applications as a flexible alternative to copper tube in both hard and soft water areas. Flexible and fully demountable push-fit plumbing system ranging from 10-22mm. Suitable for all domestic/commercial hot and cold water...

www.screwfix.com

 

[SquirrellCook]

Would this work?

CARAVAN MOTORHOME 12V 30PSI 5.3LPM FLOJET WATER PUMP TRUMA WATER SYSTEM NEXT DAY | eBay

Find many great new & used options and get the best deals for CARAVAN MOTORHOME 12V 30PSI 5.3LPM FLOJET WATER PUMP TRUMA WATER SYSTEM NEXT DAY at the best online prices at eBay! Free delivery for many products.

www.ebay.co.uk

Shop around, you may find a better price.

 

[susarich]

Shop around, you may find a better price.

Will do, I need to shop around for the best price on truma combi 4e anyway.

The 2e would probably be fine, but the price difference is very little.

 

[susarich]

Can anyone help, which one do I need to buy?
Also do you think its worthwhile me getting a expansion tank?

Thanks everyone

 

[SquirrellCook]

Can anyone help, which one do I need to buy?
Also do you think its worthwhile me getting a expansion tank?

Thanks everyone

Check what pressure your Truma will take. Just remember with a small amount of water onboard it might be better if it just trickles from the taps.
Does your water heater require one? They are also used to reduce cycling of the pump, but going without if you can will save weight.

 

[Squiffy]

Can anyone help, which one do I need to buy?
Also do you think its worthwhile me getting a expansion tank?

Thanks everyone

A Truma combi4 has a max working pressure of 2.8bar = 40 psi. So I would personally go for the 30psi as there is little difference in price if you shop around. As for the flow of water from a small storage tank, you can open the taps to a dribble or full flow it's up to you, but at least if you want full blast it's there if you open the tap fully. Phil

My view on expansion tanks as I've mentioned before is it's unnecessary in a medium size conversion, but could be needed in a large coach size conversion where the pipe work has long runs and multiple taps. Although the pipe work itself becomes an expansion tank in its own right if using plastic pipe as there must be a slight expansion within the pipe work when the pump pressure builds up.

 

[Nabsim]

I had nothing to do with my water/heating installation, it was done before I bought the van and carried out by a company specialising on water, air, hydraulic systems. Unlike a lot of vans it has a calorifier heated by the engine. The system has both an expansion tank and an accumulator. Mine is a pressurised system which ‘I think’ is why it has thee passion tank but not sure.

 

[Squiffy]

I had nothing to do with my water/heating installation, it was done before I bought the van and carried out by a company specialising on water, air, hydraulic systems. Unlike a lot of vans it has a calorifier heated by the engine. The system has both an expansion tank and an accumulator. Mine is a pressurised system which ‘I think’ is why it has thee passion tank but not sure.

Hi Nabsim, the reason for an expansion/accumulater is to stop pulsing of the water flow caused by the water pump using the accumulater, and to help with thermal expansion in the hot water system by using an expansion tank. In general the use of an expansion tank in a motorhome is not necessary. So depending on what type of pump you use depends on whether you will require an accumulator or not, if your pump is of the diaphragm type such as like the old electric pumps they used on British cars to supply fuel to the carbs in the 50-80s then you would probably like to use an accumulator to steady the flow but if you have a high pressure rotary type pump which uses multiple diaphragms the flow of water is smoothed out to the point that an accumulator is unnecessary. Phil

In the case of using a colorifier then an expansion tank would help with the expansion of the hot water system as if I'm correct there is no on/off situation once the engine is running so the domestic water will rise till it is the equivalent to the engine coolant temp, though I could be wrong on that assumption, I'm sure those who know the calorifier systems will correct me on that.

 

[Nabsim]

You are correct about the calorifier, it gets as hot as the engine coolant, no off

 

[SquirrellCook]

You are correct about the calorifier, it gets as hot as the engine coolant, no off

But you can fit a tap.

 

[Nabsim]

But you can fit a tap.

You could if you wanted, could also fit some sort of thermostatic bypass but no need