The Glasshopper is a low temperature Stirling engine built with a clear glass cylinder which enables a view of the internal workings.
It’ll work on any cooler stove surface like Soapstone, or with cooler fires that are fed irregularly. Use on any wood stove or multi-fuel stove surface with a low start up temperature of 90° C (194° F).
Named the Glasshopper for its clear glass displacer and piston cylinder – you are able to see the moving piston and displacer while the engine works.
Low Temperature Stirling engine
When you use a Glasshopper stove fan you can reduce your wood usage by up to 22% and heat your room up to 40% faster.
The 2021 / 2022 Glasshopper model includes the following design modifications –
- Profiled fan blade for enhanced air circulation
- Light-weight composite crank for higher RMP
- Dust cover included
Stirling Engine Design
Warpfive stove fans are small precision engineered Stirling engines, which are 100% mechanical and do not have any electric components which may stop working if overheated. Consequently they are extremely reliable and with care will last a lifetime. Find out more here
Every engine is precision engineered and hand built with durable materials like stainless steel, aluminium, brass and Borosilicate glass. As a result they operate quietly – typically 28dB.
Advanced materials (such as graphite) and low friction bearings ensure low maintenance, plus heat flow is optimised with a silver thermodynamic heat plate.
Stirling engine stove fans have a high power output and low start up speed so they move large volumes of warm air.
Every engine is hand-crafted, assembled and tested in Great Britain.
- Low temperature Stirling engine with aluminium base
- Clear glass cylinders enable a view of the moving piston and displacer
- Low start-up temperature of only 90° C (194° F)
- Maximum stove top temperature 450° C (842° F)
- Circulates in excess of 320 CFM (cubic feet per minute) of air
- Uses a large 4 blade high aspect ratio fan (285mm, 11.2 inch diameter) to circulate maximum air at low RPM
- Light weight composite crank
- Operation is quiet – typically 28dB
- Dust cover & maintenance kit included
- 3 year manufacturer’s warranty
Dimensions & Weight
Overall height: 325 mm (12.8 inches)
Base dimensions: 110 mm (4.3 inches)
Weight: 1 kg / 2.2lbs
Fan diameter: 285 mm (11.2 inches)
Submit your review
Great design and engineering! It works very well on my soapstone stove. Quick and polite response, and prompt delivery increases trust to the product. The logo of "Great Britain" on the top plate is shining!
I ordered the Glasshopper for a friend of mine in New Zealand (on the back of my own purchase of the sidewinder). WarpFive are a very good company to do business with and any questions I posed were answered swiftly and actually called me back informing me they had found a cheaper courier.
The fan arrived in NZ 3 days ahead of forecast and my pal is delighted with the build quality, the engineering (even as they enter summer-it will be a centre piece😀) and the warm fuzzy feeling that a small firm in Dawlish can make little gems like this! Chapea!
Recieved my twinspeed and glasshopper stove fans last week. Arrived after their long journey in excellent condition, nice to see the packaging is recycled/recyclable materials. The engineering and construction of these fans is second to none. Work like a dream and very quiet! Thoroughly enjoy watching them in action, almost mesmerizing. 🌟🌟🌟🌟🌟 from me.
Delivered at warp speed! Set it up really simply and lit the fire. When warm, gave the blade a little nudge and away it went. Great. Not much evidence of a draft from it and wonder whether the blades are as aerodynamic as they could be … but it looks great.
Thank you for my Glasshopper Stove Fan. The product came very well packaged and no damage was incurred during transport. I appreciated getting updates on tracking progress. The fan is certainly a very impressive, precise and beautiful piece of engineering. I enjoy explaining to people how it works. Warpfive was very helpful in answering my queries.
I bought the Glasshopper fan recently (as a birthday present to myself; always safer to buy one’s own) and I’m delighted. It is a lovely piece of engineering, and beautiful piece of kinetic sculpture. Both my father (84) and daughter (10) are entranced by it. The fact that it works at lower temperatures is ideal for our stove which has a cooking section meaning it’s top does not get so hot. Well done Warpfive and well done Rev. Dr Stirling!