Dale Hodgins wrote:They look nice, don't they. ? A tour of the website fails to explain anything to my satisfaction. Numerous products are offered. A little 4" core is $350 and $90 shipping. That's $440 in total. If I needed a 4 inch core, I'd spend $30 on supplies and build one.
Okay, don't buy. Our materials alone cost us many times more than your target $30, not to mention labor, cost of molds, cost of kilning, overhead etc.
Why the hostility? We are a small company trying to bring rocket heater concepts and technology to the larger permies. We don't have excessive mark ups, it's just expensive to produce a quality core, as considerable dialog on this forum under other topics has shown. We produce quality, tested, ready to use products, for those people who just want to build a heater quickly, that will last and have it work right the 1st time.
How are these products unique ? What makes them better than one built at home ?
This question is answered in detail here...
http://www.dragonheaters.com/rocket-heater-shippable-core/
Including a link to the development of the design (by Peter van den Berg) vs. a standard rocket heater.
We have also published extensive data logs on temperatures, efficiency, and emissions on the blog site here. Data which is largely missing from the rocket heater world, but which we publish in the clear.
http://blog.dragonheaters.com/category/dragon-notes/
There was also a review of the core done by Donkey some months ago published on this forum.