I'm planning to build a steam boiler using a cement and vermiculite (or perlite) mix, and I want to coat the inside with rubber. I'll be using a 3kW water heating element for the heat source. I'm considering adding a metal mesh to prevent cracking, but I'm also worried that it might cause more cracking due to differences in heating and cooling rates. I can't afford to go with a full metal design, so I'm sticking to this method, even though I've heard metal might be necessary. I need this boiler to last about 4-5 months, and I have some extra cement for repairs. Any advice would be really appreciated since this is my first time trying to build something like this!
2 Answers
I'd recommend checking out heat-resistant coatings rather than just rubber since it may not hold up well to the steam. Cement's great for thermal mass, but a good seal is crucial to prevent leaks. Just monitor the heating element to ensure it doesn’t overheat. Good luck, and remember, safety first!
Going with a cement mix can be tricky, but it’s definitely doable! Just make sure to mix it thoroughly and allow proper curing time. The metal mesh is a good idea, but consider the type of rubber you use on the inside—some can handle heat better than others. Just be careful about how hot things will get! Size-wise, what capacity are you planning for?
I'm aiming for about 30 liters.