Wednesday, July 2, 2025

Metalfire Optimum 700-900?

Now we have 4 m3 firewood piled up, and it's 33º and end of June, it's time to take steps for the new stove.  Engineer Jansen really likes the Metalfire Optimum inserts. There are two versions, a 70cm and a 90cm wide version. The 70cm should suffice for our heating needs, but big is beautiful, and an Optimum 900 would be...  nice. The price difference is minimal.

Find out if it would fit the existing mantle: make a hole to access the interior for measurements:




Ladrillo




The casing is made of ladrillo, ceramic blocks, 7cm thick.

Inside

Odd, no insulation anywhere. Yes, that is a concrete pillar at the back. It shoild have been insulated from the stove! Bad!



Measurement

The Metalfire 900 is 904mm wide, installation specification tells you to surround the stove with plates of Silca T300, 5cm thick. So, minimum width is 1004 mm. The inside of the casing is 92cm. So, an Optimum 900 does not fit.

That is disappointing! Asked Metalfire if an air gap between stove and wall of 1 cm would suffice. It won't, they say. No idea if ceramic ladrillo really cannot withstand the heat. Will find out. Else the engineer will have to accept an Optimum 700.












Heat

Hottest days of the year so far, 31-33º: time to order some firewood!

Leña! 4m3.

Last winter chopping up the big blocks was a daily chore. Good workout, but.

This time we asked for "leña para estufa", so you get wood in nice smallish chunks, else you may get huge chunks of terribly hard root that is unsplittable, even by Engineer Jansen.

If you order now there’s 6 months drying in the sun and heat. Last winter Engineer Jansen had his certainties about the humidity of the wood, having bought an electronic wood humidity tester, and the orange test light lit up far too often. Too humid wood gets you less heat, more air pollution, and soot up your chimney. Engineer Jansen does not like air pollution, and soot up his chimney.

Piling up is fun. I think we have room for 2 m3 more!

Delivery, 4 m3

Two heaps, one on the P, one in the driveway.




Pile #1:


Pile #1

Piling up #2: