Hi all,

Was out and about today and i saw a Bosch 25e highflow that was recessed into a wall cavity,only about 20mm of the front,mainly the front cover was protruding from the wall,it had a galvanised finned cover underneath that was screwed to the exterior plastered type wall surface for access to the isolating valves. Above the appliance say about 250-300mm i noticed an oval shaped externally mounted outside light fitting slightly bigger than a can of coke. Was looking in 5261 under minimum clearances for flue terminals to electrical fittings and the only reference was to an electrical meter or fuse box. It did have a small say 30mm angled flashing above the recessed hole the appliance was in as possible heat deflection although it was not in any way covering or obstructing the external front flue outlet. I dont think its dangerous how it is but want to know what others think and if it is in breach of the code,as i will then go tell that particular homeowner the lights got to be moved,or removed.

Also just out of interest for myself, have put in quite a few water heaters of the instantaneous type in the last few years and i have been asked on more than one occasion even when ive been on a property for a un-related plumbing or gasfitting matter why they turn on for a second or so when a cold tap inside the home is operated. The best answer i can come up with for them is usually something along the lines of the drop in water pressure on the appliances inlet valve causes a momentary pre-cycle start up as it adjusts itself to a much lower operating pressure,followed by theres not much that can be done etc... Can anyone put me on the right track??

Comments and opinions would be well recieved,always enjoy learning something new as often as possible

    

Linkback: https://www.plumbers.nz/instantaneous-water-heaters/67/general-instantaneous-water-heater-installation-questions/1068/

Thanks for the tip, it seems logical that either of those ideas would prove effective. It happened to me once ages ago but was at a random house just the other day and the client queried me about it out of interest and was sick of not knowing without a doubt what causes it.Thanks for the reply.

Yeah there is no soffit,just fascia board and spouting etc...the light is actually mounted on the wall above the recessed appliance, 250-300mm above. Had to take a second look when i walked past and its had me thinking. When running the appliance i went outside and had a look out of interest ,the flue gas doesnt seem to affect it at all,the heat in the flue gas pushes out not up etc and the plastic body of the light remains dead cool but the big thing is...is it suppose to be there or not?

Any chance you can post a pic?

Went past so stopped and photographed this installation today. As ive recently been on the property I dont want to be burnt for something someone else has done. Cant find anything in NZS 5261 that says it cant be there. I tested it while I was on site a few months ago as I said in an above post and the heat from the exhaust port doesnt in any way heat or warm the plastic light in case anyone was wondering. It stays dead cold. I think it should go, it just doesnt look right being that close.

What do you guys think?   

i actually would be more worried about burning my face as i walked past it when its was in operation perfect head height???

let me know what Bosch says mate about clearences, this is the  exact same model as I got on the one charge, which is bollox. Do me a favour while your talking to bosch can you ask specifically about under a openable window.

As far as it firing with the cold turned on....I had one that the owners had put both hoses off their washing machine in to a "y" fitting and hooked them to the one tap for the water, so it may be a crossed/joined hot to cold supply??

with banjo's