POWER OF ATTORNEY

        I, Nicholas Walrod, hereby authorize and designate each of James
Lightman, Adrain Bryant, Joseph Army, and John Landry, signing singly, as my
true and lawful attorney-in-fact to:

        (1)    execute for and on my behalf, in my capacity as a Section 16
filer of Vapotherm Inc. (the "Company"), the Forms 3, 4 and 5 in accordance
with Section 16(a) of the Securities Exchange Act of 1934, as amended (the
"Exchange Act") and the rules and regulations promulgated thereunder;

        (2)   do and perform any and all acts for and on my behalf which may be
necessary or desirable to complete and execute any such Form 3, 4 or 5, complete
and execute any amendment or amendments thereto, and timely file such form with
the Securities and Exchange Commission, any stock exchange or similar authority;
and

        (3)   take any other action of any type whatsoever in connection with
the foregoing which, in the opinion of such attorney-in-fact, may be to my
benefit, in my best interest, or legally required of me, it being understood
that the documents executed by such attorney-in-fact on my behalf pursuant to
this Power of Attorney shall be in such form and shall contain such terms and
conditions as such attorney-in-fact may approve in such attorney-in-fact's
discretion.

        I hereby further grant to each such attorney-in-fact full power and
authority to do and perform any and every act and thing whatsoever requisite,
necessary, or proper to be done in the exercise of any of the rights and powers
herein granted, as fully to all intents and purposes as I might or could do if
personally present, with full power of substitutes or revocation, hereby
ratifying and confirming all that such attorney-in fact, or such attorney-in-
fact's substitute or substitutes, shall lawfully do or cause to be done by
virtue of this Power of Attorney and the rights and powers herein granted.  I
hereby acknowledge that the foregoing attorney-in-fact, in serving in such
capacity at my request, is not assuming, nor is the Company assuming, any of my
responsibilities to comply with Section 16 of the Exchange Act.

        This Power of Attorney shall remain in full force and effect until I am
no longer required to file the Forms 3, 4 and 5 with respect to my holdings of
and transactions in securities issued by the Company, unless earlier revoked by
me in a signed writing delivered to the foregoing attorney-in-fact.

        IN WITNESS WHEREOF, I have caused this Power of Attorney to be duly
executed as of this 8th day of December, 2020.

                                        /s/ Nicholas Walrod
                                        --------------------------------------
                                        Nicholas Walrod