heat-engine: command not found

Have You tried accessing the binary with the full path?

Maybe Your $PATH variable doesn't contain the default paths? echo $PATH should give something like:

[root@server ~]# echo $PATH
/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin

If it's empty, You may set the PATH variable with this command

export PATH="/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin"

On Debian possible default full paths are:

/usr/bin/heat-engine - from package: heat-engine

You may install the required package with command apt-get install {package}
Error in other languages:
heat-engine: bevel nie gevind nie
heat-engine: comandă negăsită
heat-engine: comando não encontrado
heat-engine: commande introuvable
heat-engine: command not found
heat-engine: käsku ei ole
heat-engine: không tìm thấy lệnh
heat-engine: komanda nerasta
heat-engine: Kommando nicht gefunden.
heat-engine: kommandot finns inte
heat-engine: komut yok
heat-engine: nie znaleziono polecenia
heat-engine: níor aimsíodh an t-ordú
heat-engine: no se encontró la orden
heat-engine: no s'ha trobat l'ordre
heat-engine: opdracht niet gevonden
heat-engine: parancs nem található
heat-engine: perintah tidak ditemukan
heat-engine: príkaz nenájdený
heat-engine: příkaz nenalezen
heat-engine: команда не найдена
heat-engine: командата не е открита
heat-engine: 命令找不到
heat-engine: コマンドが見つかりません