Heater exhaust - search for ides.

[Graham_Wright]

IDEAS!
The stern cabin heater (Chinaspascher) exhausts through the transom and I am happy with it. It is easy to check and the exhaust is well lagged. The heater baseplate is well separated from the hull.
The fore cabin is a different kettle of fish. The baseplate is not very well insulated from the hull but can be spaced further away.
In a good blow, we can dip the lee rail. I considered positioning the exhaust in the coaming but it would dangerously hot for "passers by".
In the hull, it is vulnerable to water ingress.
There is a little space to allow an upwards loop or a "there and back" silencer before the outlet proper from the hull.
I do wonder if a non return valve would be possible or even an electric shut off valve. With a one inch exhaust pipe, a solenoid operated one would be heavy on the juice. I wonder if there is such a variety as those found in central heating zone valves (which are mains operated and still take current even when fully open.
Ideas and opinions please.

 

[vyv_cox]

Surely you are never going to run the forecabin heater when under sail? Put a bung in the skin fitting before setting off.

 

[Graham_Wright]

Surely you are never going to run the forecabin heater when under sail? Put a bung in the skin fitting before setting off.

You are correct but, "when one reaches a certain age, one can forget"!
I much prefer something automatic.
It is enough of a challenge to remember to turn the gas off when leaving the boat (despite a check list)!

 

[rogerthebodger]

Would a flap on the outside of the hull like the flap on vertical exhaust pips help to stop ingress of any water

 

[vyv_cox]

My experience of NRVs is that they are never 100% leak tight.
I suspect that most solenoid valves would not take exhaust gas temperatures.

 

[jlavery]

I have a bung in our heater exhaust, and a "bung in" sign which is hung on the heater control. The sign lives with the bung when the latter is out.

 

[Plum]

IDEAS!
The stern cabin heater (Chinaspascher) exhausts through the transom and I am happy with it. It is easy to check and the exhaust is well lagged. The heater baseplate is well separated from the hull.
The fore cabin is a different kettle of fish. The baseplate is not very well insulated from the hull but can be spaced further away.
In a good blow, we can dip the lee rail. I considered positioning the exhaust in the coaming but it would dangerously hot for "passers by".
In the hull, it is vulnerable to water ingress.
There is a little space to allow an upwards loop or a "there and back" silencer before the outlet proper from the hull.
I do wonder if a non return valve would be possible or even an electric shut off valve. With a one inch exhaust pipe, a solenoid operated one would be heavy on the juice. I wonder if there is such a variety as those found in central heating zone valves (which are mains operated and still take current even when fully open.
Ideas and opinions please.

Can't you just go vertically out through the coachroof top just as you would with a taylors paraffin stove which uses one of these on a 1 inch chimney?

 

[roaringgirl]

If it's regularly going to be exposed to seawater, it'll rust through in no time.

 

[Graham_Wright]

Can't you just go vertically out through the coachroof top just as you would with a taylors paraffin stove which uses one of these on a 1 inch chimney?
View attachment 165394

Unfortunately, it would be hoiked off by the jib sheets (like the ventilator).

 

[Graham_Wright]

My experience of NRVs is that they are never 100% leak tight.
I suspect that most solenoid valves would not take exhaust gas temperatures.

Would a ball valve suffer in the same way? The ball generally rotates in a plastic housing.

 

[rogerthebodger]

I used one of these as a exhaust vent from a instant gas water heater and no issues with lines catching and the exhaust vented OK'

 

[rogerthebodger]

Would a ball valve suffer in the same way? The ball generally rotates in a plastic housing.

Ball valves generally have a PTFE seal so could stand some heat

 

[Graham_Wright]

I used one of these as a exhaust vent from a instant gas water heater and no issues with lines catching and the exhaust vented OK'

Now that looks promising. Is it a dorade?
Please identify the manufacturer.

 

[rogerthebodger]

Now that looks promising. Is it a dorade?
Please identify the manufacturer.

I extended the exhaust tube a little above the deck so the help stop water flowing into the exhaust

Vetus do then get the one without the window so the heat does not effect the plastic widow

Vetus UFO Deck Ventilator in Stainless Steel (200mm OD)

I would think most chandlers would be able to get then

 

[vyv_cox]

Ball valves generally have a PTFE seal so could stand some heat

PTFE is good for 200C (just about). Some have nylon seals that are nowhere near as heat resistant, so check needed.

I fitted one of those vents recently. All the internal part was plastic.

 

[Graham_Wright]

I do have a non return valve that probably wouldn't fail;-
(It doesn't open either without extreme force! I think it's probably for hydraulics.)
(Not a serious suggestion!)

 

[rogerthebodger]

PTFE is good for 200C (just about). Some have nylon seals that are nowhere near as heat resistant, so check needed.

I fitted one of those vents recently. All the internal part was plastic.

On mine the internal ring was plastic which I throw away and the metal exhaust tube I fitted protruding through the deck to replace the plastic

The one with the window has a plastic window which is why I used the exact one I posted

 

[vyv_cox]

On mine the internal ring was plastic which I throw away and the metal exhaust tube I fitted protruding through the deck to replace the plastic

The one with the window has a plastic window which is why I used the exact one I posted

Not sure how you are going to keep the water out without a NRV of some sort. Presumably your open exhaust pipe sticks upwards with the ventilator cover over the top?

I have a couple of these on deck, complete with all the plastic that includes a shutoff valve. Even then we get some water inside in big seas

 

[rogerthebodger]

Not sure how you are going to keep the water out without a NRV of some sort. Presumably your open exhaust pipe sticks upwards with the ventilator cover over the top?

I have a couple of these on deck, complete with all the plastic that includes a shutoff valve. Even then we get some water inside in big seas

That's exactly how I fitted it the exhaust sticking up with the cover over the top

I does depend on how close the exhaust sticks up inside the cover. As my heater was only used while the hot water was running I made it about 10mm bwow the underside of the top

I also have a similar setup and my cuttent boat but out the side of the cabin

The only pic I have below shows the side vent between the front 2 windows on the cabin side

https://flic.kr/p/WHWbkA

Inside I made a type of dorado box to catch any spray/ green water

 

[MontyMariner]

Do you have an anchor locker?
Could you vent into that?