Boiler removal- Herald Hunter.

[stewie1046]

[Stubby]

44 minutes ago, stewie1046 said:

But its still there 🙂

[spudulike]

Perhaps he wants someone to help him lift it out Do what I do...get the wife to help

[stewie1046]

Sorry missed out question- it’s a herald hunter- with an integrated back boiler . Can we use it as a room heater only - is there a safe way to do this?

[openspaceman]

9 hours ago, stewie1046 said:

Sorry missed out question- it’s a herald hunter- with an integrated back boiler . Can we use it as a room heater only - is there a safe way to do this?

Perceived wisdom is you fill the boiler with dry sand and don't cap the top exit so it can breathe

[Will C]

Yes sand will give you a heat battery realising heat for a few hours after the fire is out. Kiln died sand is the easiest to pour in. Don’t not under any circumstances block off all the holes, the highest one needs to breathe or you can potentially make a bomb! 

[openspaceman]

I have not filled a boiler this way but the sand also conducts heat away from the fire and thus protects the metal from burning. You could also put a vermiculite sheet between the flames and the boiler. This would keep the firebox temperature up, good for clean burning. The big problem with back boilers is that because they are relatively cold, always sub 100C, they quench he flame and this is a big cause of particulates.

[GarethM]

Sand yes, but personally I'd replace it with something newer and more efficient.

 

You'd probably get half the price back of a new one on fleabay

[AHPP]

3 minutes ago, openspaceman said:

I have not filled a boiler this way but the sand also conducts heat away from the fire and thus protects the metal from burning. You could also put a vermiculite sheet between the flames and the boiler. This would keep the firebox temperature up, good for clean burning. The big problem with back boilers is that because they are relatively cold, always sub 100C, they quench he flame and this is a big cause of particulates.

 

 

Is recovering heat from exhaust better?

[openspaceman]

1 minute ago, AHPP said:

 

 

Is recovering heat from exhaust better?

Difficult question; if the stove is properly designed and run then the exhaust should only be warm enough to carry the combustion products up the chimney without any vapours condensing out, if combustion is perfect there is only water vapour to condense. The main thing is that the flame should be able to burn out completely without impinging on any cold surfaces or meeting any cold draught, the heat exchange then takes place after this. This is why modern stoves are refractory lined.

Perceived wisdom is that all the massflow should reach 800C and have a residence time of 1.5 seconds for clean combustion.