[windowwashers]

thinking about this, you guys I would bet on your insurance will not be covering you If reading this I would not insure any of you, trial and error is fair enough, but you are putting this in the public and some of the thing to are trying are dangerous including the discount he Sol.

I hope this never happens but you need to look at it as in yesterday.

Playing is one thing danger is another, again some of the comments I am shocked at.

[Nathanael Jones]

I don't believe that's possible Nathanael. I would say it's impossible. Even for the most skilled gas engineer you know this is not possible.You are talking nobel prize winning IQ and physics capabalility to do this.

That Nobel prize is going to look very nice on my mantle piece!!! It's done,... it's working! I'm going to change the relay for a more sensitive one which will allow me to dial the flow even lower,.. once I've figured out the right one for the job, I'll post details. It's really quite simple actually!
 

thinking about this, you guys I would bet on your insurance will not be covering you If reading this I would not insure any of you, trial and error is fair enough, but you are putting this in the public and some of the thing to are trying are dangerous including the discount he Sol.

I hope this never happens but you need to look at it as in yesterday.

Playing is one thing danger is another, again some of the comments I am shocked at.

The modifications I'm making to the heater are minor, and electrical only. The safety features like the overheat sensor, the oxygen sensor etc. are all still in place and functioning,... the modification just replaces the flow sensor.

[chris@c.m.s]

Nathanael I am a qualified Plumber/heating engineer, you may well have a grasp on what is safe to alter but to give instructions online for others to follow if thats what you intend is irresponsible and dangerous it assumes a level of competence that not all would follow Please leave these things to the pro's.
   

[Nathanael Jones]

Nathanael I am a qualified Plumber/heating engineer, you may well have a grasp on what is safe to alter but to give instructions online for others to follow if thats what you intend is irresponsible and dangerous it assumes a level of competence that not all would follow Please leave these things to the pro's.
   

The Disclaimer:
First of all, let me say that this is for information only, and even the accuracy of the information contained is not guaranteed. The aim of this info is simply to show you what is possible, what I have done and how I’ve done it, along with the results I’ve enjoyed.
I by no means suggest that you should do the same yourself. If you do decide to follow my example, then I accept no responsibility for the results (unless they are good!).
Working with pressurised flammable gas is dangerous, and should only be attempted by persons qualified to undertake the work.
Hot water also presents a scalding risk, and precautions should be taken.
Gas heaters need to be adequately ventilated and have an exhaust system installed. Incorrect installation can lead to a deadly build up of fumes.
In short, this project should not be undertaken by any person, living or dead, in any circumstances, no matter how clever or qualified you may be.

[Nathanael Jones]

The top pic is the flow switch built into the heater. The green wire doesn't do anything, but connect the red and yellow and the heater starts,... simple as that.
The switch in the heater is operated my a manual lever that moves as the water flow increases, and depresses/releases the switch. The problem being that the flow rate has to be quite high for the lever to move and release the switch.
I'm simply replacing the flow switch with a more efficient and reliable switching device, that will operate at a lower flow rate. Lower flow rates mean higher temps, so it is essential that the overheat sensor is left in place and is fully operational.
I've simply connected the red and yellow wires to a relay which is activated by the power running through the pump. Jeff on the training academy drew up the diagram below for me. The relay is connected with the pressure switch in between, so when the pump stops, the heater does too.

The flowmaster is basically a variable resistor,.. so at low settings there isn't the full 12 volts across the relay to activate it,... I still have to turn the dial to 4 or 5 to get the relay to switch.
All I need to do to perfect the system is source a relay that operates on a slightly lower voltage and will kick in when the flowmaster is at setting 1 or 2.

[chris@c.m.s]

well done my application for the MGWC is in the post  :

[Nathanael Jones]

well done my application for the MGWC is in the post  :

Great stuff Chris! Richard is handling the new applications at the mo,...you should hear back from him shortly.

[Nathanael Jones]

Nathanael,
Take your pic and comments down because you'll get into legal trouble. No disclaimer can cover you for this, even if you think i'm talking rubbish please do this.

Honestly,... I don't believe that the modifications I've mentioned could be described as anything but minor,.. and seriously, anyone who attempts it does so at their own (very small) risk. I'm not worried.
If the Mod's feel otherwise I'll happily remove the pics & info.

These heaters cannot be sold in the UK, they are dispatched as gifts. This is because of the absent CE mark. If it was doable to dial down the flow whilst still allowing a safety margin i'm sure the manu's would have done it.

The heaters are dispatched as gifts to bypass import duty,.. no other reason. They are UKAS and moody certified, and I searched for info to find out if the CE mark was a legal requirement, but could find no evidence that it was,.. battery powered devices seem to be exempt?

What safety margin is compromised by reducing the flow rate? At standard flow rates it is possible for the heater's overheat protection to kick in when the flame is turned up high,.. so with a lower flow rate and a lower heat setting I can't really see any difference? 

[Nathanael Jones]

They are being sold and imported to the UK,.. albeit through ebay,... but aren't many other goods from China exactly the same?

[Clive McDonald]

They are being sold from america, this is not part of the uk last time i looked. They come in as gifts not gas heaters and this is because they need a CE mark to be sold directly in the UK. That parts not the concern though, as you know i've got one too.

[Nathanael Jones]

Mine came from China, from and ebay seller based in Australia.

You mention "Mariboza" heaters,... mine is an "Arazibo" one, and it does have the UKAS and Moody safety marks. From what I could find out, mains voltage equipment does need a CE mark to be sold in the UK,.. battery powered equipment does not,.... at least as far as I could discern.

[Captain Scarlet]

Hi Nathan, hows things going? Havent spoken to you in a while!! Luke

[Nathanael Jones]

Hi Nathan, hows things going? Havent spoken to you in a while!! Luke

Hi mate, how you keeping?

Things are good,... VERY busy,.. but that's always a good complaint!

You make a start on your hot system yet?

[Captain Scarlet]

Youve got email Nathan, Luke