heat: command not found

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 - from package: python-heatclient

You may install the required package with command apt-get install {package}

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