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Discuss Stainless steel pipe - which fittings? in the Fittings & Pipes area at UKPlumbersForums.co.uk.

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  1. Dave Luck

    Dave Luck New Member

    Hi, I'm making a hot tub and want to heat the water indirectly by running a couple of lengths of pipe along the bottom of the tub.

    I'm heating indirectly because of the chemicals and because I'm taking the heat from the common buffer store.

    I thought about pex but I'm not sure that plastic pipe will radiate the heat quick enough or what its resistance to chemicals is, which leaves me with stainless.

    Can I use normal copper fixings and normal solder or do I have to go specialist?

    Cheers

    Dave
     
  2. Riley

    Riley Plumber GSR Top Contributor!!

    Hello mate. Sounds like a horrific accident waiting to happen I'm sorry to say. I wouldn't want to tread on a hot heating pipe got burns written all over it. In addition you are looking at stagnation if the water isn't circulated, filtered or heated correctly. There's nothing wrong at all with the inflatable hot tubs like lazy spa that do it all for you. I just think you are going to wind up wasting money and having a massively insatisfactory tub at the end.
     
  3. Dave Luck

    Dave Luck New Member

    Pipes will be out of harms way so stepping or sitting on them.

    Circulation and filtering all taken care of so no stagnation or water borne disease issues.

    Got a pop up spa. Its OK but not what I want.

    Just need to know about them fixings is all.
     
  4. Nostrum

    Nostrum Plumber GSR

    Pipes internally or externally?

    You'd be better pumping through a plate heat exchanger if you can.

    As for solder? You won't solder stainless.
     
  5. ShaunCorbs

    ShaunCorbs S. Mod Trusted Plumber GSR Top Contributor!!

    wrong you can solder ss but it needs special flux and solder and ss fittings
     
  6. Dave Luck

    Dave Luck New Member

    Yeah, I had a look at the heat exchangers and then cried when I saw the prices.

    A nice gentle increase in heat is OK with me so I was thinking about running the pipes internally and just let that heat get sucked out by the water. Let convection and circulation do the rest. You know pseudo Roman style. ☺ not the most efficient system but nice and simple. The heating water will run at about 12 degree delta and seeing as the spa water needs to be a Max 38 degrees can be run off my solar panels in the summer. Don't ask about winter, you won't like the answer but it involves my new pellet boiler and the dumping my spare heat from my buffer...

    All the joins will be outside of the spa and not in contact with the chlorinated water so could I use copper compression fittings? Or is mixing the 2 a complete no no? ( different expansion rates or whatever?)

    Assuming stainless is the way to go if I get the socialist solder and fittings is it like soldering copper? Easier/harder that kind of thing.
     
  7. Dave Luck

    Dave Luck New Member

    Socialist? Damn you auto correct! Specialist!
     
  8. ShaunCorbs

    ShaunCorbs S. Mod Trusted Plumber GSR Top Contributor!!

    if your planning on running via an unregulated heat source eg panels or boiler i would use a blending valve (similar set up for underfloor heating) but i wouldnt want the pipes in the tub as you could come in contact with them
     
  9. Dave Luck

    Dave Luck New Member

    You definatley will not be coming into contact with the pipes

    Not sure what you mean by unregulated heat sources? Thermostats, pressure release valves and over heating protection will be in place if that's what you mean?
     
  10. ShaunCorbs

    ShaunCorbs S. Mod Trusted Plumber GSR Top Contributor!!

    on the tub circuit or just your heating (house)
     
  11. Nostrum

    Nostrum Plumber GSR

    Plate heat exchangers can be picked up for about £50 - £80.
     
  12. Dave Luck

    Dave Luck New Member

    Both, I'll be fitting another tdc and timers etc for controlling the water temp and running pumps for the tub and the tub circuit will have its own safety mechanisms in addition to what is already in place for the heating.

    Now back to the fittings. What can I use?
     
  13. ShaunCorbs

    ShaunCorbs S. Mod Trusted Plumber GSR Top Contributor!!

    you have a few options

    solder costs a bit
    press fittings not to bad but you need to hire a gun
    tig welded costs a bit
     
  14. Dave Luck

    Dave Luck New Member

    QUOTE=ShaunCorbs;829523]you have a few options

    solder costs a bit
    press fittings not to bad but you need to hire a gun
    tig welded costs a bit[/QUOTE]

    Blimey, so is the soldering doable from a competent diyer? Are the principals the same as copper? I don't mind ballsing up a few joints while practising but if it's a bit of a black art then I'll have to rethink my options.

    Sorry for the questions but I'm having a panic moment thinking that I might have to call in a professional!
     
  15. Dave Luck

    Dave Luck New Member

    Ooohhh, where from Nostrum? That's considerably more reasonable than what I've been looking at.
     
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