Lagging for an external condensate pipe

[Alan 483256]

Can someone point me in the direction of the correct lagging for an external condensate pipe?
After mine froze up a few years ago, I fitted a strip heater and lagged it and it's been fine since.
BUT the lagging has deteriorated badly, I'm guessing from UV exposure.
What's the correct product to use?, the outside diameter of the pipe is 42mm

 

[denso13]

https://www.armacell.com/en-GB/product/technical-specs/htarmaflex

 

[Harry Bloomfield]

Many modern boilers, discharge their condensate in batches, and the water will at least be warm. If the slope of the discharge pipe allows it to drain away quickly, then it is unlikely to freeze on the route down, so I wouldn't be too concerned about it freezing.

The larger pipe, and insulation, was a response to the early condensing boilers, which dripped condensate in a steady stream, through 15mm pipes, which did suffer freezing in the cold weather. The boiler would detect the freeze up, and shut down.

 

[Alan 483256]

Many modern boilers, discharge their condensate in batches, and the water will at least be warm. If the slope of the discharge pipe allows it to drain away quickly, then it is unlikely to freeze on the route down, so I wouldn't be too concerned about it freezing.

Not this one, it HAS frozen - before the lagging+heater was fitted.

 

[opps]

Many modern boilers, discharge their condensate in batches, and the water will at least be warm. If the slope of the discharge pipe allows it to drain away quickly, then it is unlikely to freeze on the route down, so I wouldn't be too concerned about it freezing.

The larger pipe, and insulation, was a response to the early condensing boilers, which dripped condensate in a steady stream, through 15mm pipes, which did suffer freezing in the cold weather. The boiler would detect the freeze up, and shut down.

Yeah, I have seen condensate pipes which froze and prevented the combi from working. The "plumber" drilled a small hole higher up to let the warmer water drip out . Short term fix , but it worked.

 

[gas112]

Many modern boilers, discharge their condensate in batches, and the water will at least be warm. If the slope of the discharge pipe allows it to drain away quickly, then it is unlikely to freeze on the route down, so I wouldn't be too concerned about it freezing.

remember warm water can freeze quicker than cold water

 

[Harry Bloomfield]

Not this one, it HAS frozen - before the lagging+heater was fitted.

It must be one of those boilers, which allow a steady drip out of the condensate then.