cold times on my Jeanneau Sundream. Could i use one of these on the boat? gas boilers

I’ve been looking at this as well, looked at your info relating to the Bukhs but cannot see on a 2GM20 where to connect warm water feed from.

It certainly can be done but a calorifier cannot run a heating system without constant engine running. As already pointed out this would be inefficient in the extreme. PM me if you want to discuss a calorifier installation for domestic hot water.
 
It certainly can be done but a calorifier cannot run a heating system without constant engine running. As already pointed out this would be inefficient in the extreme. PM me if you want to discuss a calorifier installation for domestic hot water.

As I read the OP, the requirement is only for hot water, not for a heating system.
 
It certainly can be done but a calorifier cannot run a heating system without constant engine running. As already pointed out this would be inefficient in the extreme. PM me if you want to discuss a calorifier installation for domestic hot water.
Will PM
 
People have mentioned boat cookers, but these are installed in a much larger space and have tiny gas consumption. A typical boat cooker's burner is around 1.5kW; these instant gas heaters are 15-30kW output - using 10 to 20 times more gas!

Patently not true-with the three rings and oven on my Island Packet cooker has far more gas consumption than the modest califont fitted to our Hartley 32. The califont in the Hartley is fitted just above and to one side of the two ring cooker, so in the same area, near the hatch and companionway. And, as I keep saying, it is usually only on for thirty or forty seconds, not hours as a stove when cooking.
 
People have mentioned boat cookers, but these are installed in a much larger space and have tiny gas consumption. A typical boat cooker's burner is around 1.5kW; these instant gas heaters are 15-30kW output - using 10 to 20 times more gas!

Agree that the gas water heaters have a greater output (5-15kw) but they would be operated for a couple of minutes, unlike the cooker where will be used for much much longer thus generating same or more of CO. However, as with everything, we need to use common sense when we operate this kind of gadgets. Regulations, on all kind of things, change every few years for the better but we can not always keep on changing gadgets that have already been installed; common sense should prevail in most circumstance.
 
I sold a boat that had had an instant gas fired water heater for about 15 years. The new owner needed an insurance survey that condemned the unit as unsafe. Even though we may believe this decision to be technically unsound it makes no difference - he was forced to remove it.
 
Patently not true-with the three rings and oven on my Island Packet cooker has far more gas consumption than the modest califont fitted to our Hartley 32.

Most IP boats seem to have Force 10 cookers. The 3-burner Force 10 has 2 x 1kW and 1 x 2.4kW burners, plus a 1.5kW oven burner, giving a total of 5.9kW if all the burners are on full. I'd be surprised if your instant gas heater has a smaller output.
 
We also have a gas water heater mounted in the galley. Used it for the 17 years we have owned this vessel. No issues provided you are aware of fumes. My gas oven produces far more fumes when cooking for an hour than a few seconds of gas heater for washing up water. The reality for me is the ‘no’ is based on a persons perception of the risk rather than reality. It is a shame in many areas of safety that some people and authorities focus on legislation rather than awareness and education of the actual risks so enabling people to make balanced decisions.

As Vyv says though, if you have a surveyor that is anti gas califonts then you may have problems with insurance.
 
Most IP boats seem to have Force 10 cookers. The 3-burner Force 10 has 2 x 1kW and 1 x 2.4kW burners, plus a 1.5kW oven burner, giving a total of 5.9kW if all the burners are on full. I'd be surprised if your instant gas heater has a smaller output.

It is 9KW. It heats 6 litres per minute full blast, more if the unit is adjusted for a lower hand safe temperature. It is an old-90's-Sakura make. It is on for so little time the gas consumption and fumes are irrelevant in normal use.
 
It is 9KW. It heats 6 litres per minute full blast, more if the unit is adjusted for a lower hand safe temperature. It is an old-90's-Sakura make. It is on for so little time the gas consumption and fumes are irrelevant in normal use.

So your statement "Patently not true-with the three rings and oven on my Island Packet cooker has far more gas consumption than the modest califont fitted to our Hartley 32" was patently not true?:rolleyes:
 
So your statement "Patently not true-with the three rings and oven on my Island Packet cooker has far more gas consumption than the modest califont fitted to our Hartley 32" was patently not true?:rolleyes:

When the time in use is taken into account I am correct. Even if used for 5 minutes for a shower the gas consumption is far, far less than the cooker. The cooker is invariably on for far longer periods.
 
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