Question about Rheem Tankless Water Heater Manifold Control Box

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Trying to find minimum and maximum manifold pressures for rheem tankless water heater, lp gas,model74pvp-2

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  • Rheem Master
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Look on inside front cover

Posted on Nov 18, 2017


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Posted on Jan 02, 2017

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SOURCE: How can you adjust the dip switches on the Rheem

Here is the link to the service manual for your tankless water heater:

See page 35 for specifics regarding dip switch settings. If you have problems with the link, post again and I will publish it on my company website for you to review.

Richard Johnson

Posted on Aug 22, 2009

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SOURCE: how do I adjust the dipswitch on my rheem Pronto

Here is the manual. See instructions on page 2.

Posted on Dec 08, 2009

  • 6 Answers

SOURCE: replacing PCB on my tankless is there a min/max

Rheem Tech support recommends using default of 20 for both is old settings can not be retrieved from old PCB. Had the same issue and factory settings work well. Also in Lafayette

Posted on Nov 03, 2010

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SOURCE: Need to know minimum and maximum manifold pressure

Please review the Rheem water heater manual below. Page 18 will give you the manifold pressures.

I hope this helps you...Jim....Please leave a comment if this information helped.

Posted on Feb 13, 2011

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Can Richmond tankless heater which is now LP be converted to natural gas?

If it can, then it is done with dip switch settings.
Read your product manual.
Switching types of gas, and messing with dip switches is dangerous.
LP gas burns much hotter than NG, and LP pressures are much higher than NG
Call Rheem with serial number and they might supply the information to you, but will likely tell you to call service technician... leaving you in exact same spot you are in now.


Sep 29, 2014 | Rheem Richmond Encore Tankless LP Gas...

1 Answer

I want to convert my rheem tankless eco150xlp3 to natural gas. There is a gas type chip that plugs into the main board as described in the install manual. Opened the burner and the orifice looks servo...

Sell it on ebay.

A simple chip change will not convert because the orifice for each gas is different, the gas control valve is different, NG and LP gas each burn at different temperatures and pressures... with propane having higher temps and pressures.

Don't buy tankless computers and expect trouble-free installation and water heating bliss afterwards.
Read the manual for maintenance requirements, and look at the parts sheet and ask yourself how such a complex machine will simply balance and monitor water flow, water pressure, incoming and outgoing water temperatures, gas pressures, vent pressures, gas quality, gas pressures, while connected to water, gas, venting and electric systems inside your home which each have innumerable problems on their own.

Install tank type heater for around $400 and live worry free.
Avoid Rheem products since they do not post service manuals.


Sep 25, 2013 | Rheem Tankless Hot Water Heater...

1 Answer

Manifold pressure

Rheem does not post service manuals for tankless:
However you might be able to get information calling Rheem.
Copy following link for tank-type service manuals:
Add a comment and say which product you have. Otherwise it is total guesswork.

Jun 01, 2013 | Rheem Tankless Hot Water Heater...

1 Answer

Can the Rheem PTG2-42PVN be used with propane gas?

I believe PTG2-42PVN is natural gas.
Rheem site does not show that model number.
As a general rule, Rhemm does not recommend converting NG to LP and LP to NG

Contact Rheem. 1-800-432-8373

Jun 24, 2011 | Rheem Tankless Hot Water Heater...

1 Answer

Need to know minimum and maximum manifold pressure settings for a rheem tankless water heater. Model # RTG-74PVN-1

Please review the Rheem water heater manual below. Page 18 will give you the manifold pressures.

I hope this helps you...Jim....Please leave a comment if this information helped.

Feb 13, 2011 | Rheem Water Heaters

1 Answer

Tankless Hot Water Heater Rtg-74pvp-2 7.4 Gpm: hi i have a rheem tankless water heater, with flas...

Sounds like you may have the wrong type gas going to this? Is this an LP gas or natural gas unit? will say on label. Natural gas units run only on natural gas ditto for LP. Could be issue with manifold pressure settings. Could be obstruction in exchanger or vent. Have a authorized technician check over

May 17, 2010 | Rheem Tankless Hot Water Heater...

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