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Installing a Geyser in your Caravan

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The only thing better than enjoying the wonders of nature is enjoying them with a ready supply of hot water on tap. We asked the Motorhome-World team to show us how to install a geyser in your motorhome or caravan.

Once you’ve established what geyser you need for your specific requirements, you should let the supplier know exactly what you want to do with your DIY installation. When making your purchase, ensure that all the necessary fittings, nuts and bolts are included, along with the user manual.

1. Carefully remove the geyser from its packaging.
2. Remove the gas exhaust cover.
3. Unclip the controller for easier handling.
4. Position the geyser where you want it to be in your motorhome or caravan.
5. Make sure that the bottom of the floor is clean for the chassis, steel beams and so on to be drilled through.
6. Use a pencil to mark a round hole in the wall where the exhaust needs to be cut through.
7. Double-check to ensure that the centre hole is 100 mm from the floor.
8. Take extreme care and be precise when measuring the middle of the circle and drilling your pilot hole.
9. Using a 143 mm hole saw, start cutting from the outside wall.
10. Put the rubber seal in place from the outside.
11. Place the geyser in position.
12. Measure the geyser’s water pipe and gas pipe holes and drill, using the 20 mm and 16 mm bits.
13. Depending where you want the 220 V and 12 V cables to go, drill the holes accordingly.
14. Pull the water pipes and gas pipes through the hole.
15. Place the geyser in position.
16. Place the 8–16 mm hose clamps over the pipes and place the pipes over the fittings that you’re going to connect them to.
17. Tighten each clamp over its pipe and fitting, but be careful not to over-tighten it.
18. Screw the geyser to the floor
19. The 12 V cable is used to ignite the geyser with a spark as well as for the LED light on the controller.
20. Connect the geyser’s 12 V cable to a safe 12 V power point and remember to put a 10 A in-line fuse on the cable. The geyser has an internal fuse, but to save the effort you should add one in-line fuse inside, so that you’ll know where it is. It’s safer and easier this way!
21. The 220 V cable should be put into your distribution board, but if you don’t have one then put it on a safe 220 V power supply.
22. The controller’s cable is long enough for you to position it anywhere convenient.
23. You can use push-in connector fittings to connect the water pipes to the cold-water supply, hot-water supply and waste pipes. Remember to install the non-return valve to the cold-water supply into the geyser with the arrow pointing in the direction of the flow of water (that is, towards the geyser).This is important in order to ensure that the geyser doesn’t run dry when the water supply is disconnected.
24. The gas line can be pulled through to wherever the gas bottle is going to be situated.
25. Screw the gas exhaust cover on with its two stainless steel screws. If the cover is too long you can simply make it shorter by cutting it with a grinder. This is sometimes required as not all caravan and motorhome walls are the same thickness.
26. Motorhome-World recommends that you install SHURflo and Fiamma pumps. It’s also recommended that you use qualified electricians and gas specialists for all your electrical and gas installations.

You’ll need these tools:

  • Drill
  • 2 & 6 mm pilot hole drill bits
  • 143 mm hole saw
  • Flat and Phillips screwdrivers
  • Pencil
  • Tape measure
  • Push-in plumbing fittings
  • Non-return valve
  • 8 x 8–16 mm hose clamps
  • Water pump
  • 10 A in-line fuse (with fuse holder) for 12 V cable
  • Some stainless steel, self-tapping screws (8 mm and 6 mm)
  • Water heater pipes

This article appeared in the July 2013 issue.

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