Does a Navien combi boiler need an expansion tank?

Do not install a Navien tankless water heater with a external recirculating line with out a thermal expansion tank. The check valve will not allow thermal expansion to escape. Our pressure valve is releasing at 150psi. NAVIEN will say you don’t need a thermal expansion tank, WRONG!!

What does a navien combi boiler do?

Navien combi-boilers are the first true all-in-one condensing tankless water heater and boiler system that has the capacity to heat a large house and provide all the DHW for the whole family. Now you can design, specify or install one unit with two capacities, saving space, energy and water.

Where can I use a navien combi boiler?

Installations in or near media rooms, recreation rooms or any living areas of the house are possible with the quiet running Navien combi-boilers. high turndown ratio, reducing energy waste and excessive combi-boiler cycling and enhances temperature control for DHW. (NFC 11:1 for heating and DHW; NCB-E 6:1 heating,

What kind of gas does a navien water heater use?

Navien units come from the factory configured for use with either Liquid Propane (LP) or Natural Gas (NG). Before starting the installation, check the rating plate (side of unit) of the combination Water Heater / Heating Boiler to ensure the unit matches gas type, gas pressure, water pressure and electrical supply.

Where can I get the condensing combi boiler user’s information manual?

Condensing Combi Boiler User’s Information Manual Version: 4.1 (Jan. 08, 2015) Navien, Inc. 20 Goodyear lrvine, CA 92618 TEL 1-800-519-8794 FAX +949-420-0430 Getting Service If your boiler requires service, you have several options for getting service:

How does a navien heat exchanger save energy?

Navien condensing stainless steel heat exchangers recover extra heat that would be lost in non-condensing boilers. The result is a reduction in energy consumption, lower CO 2 emissions and low exhaust temperatures allowing the use of less expensive venting materials such as Schedule 40 PVC.

What kind of boilers do navien boilers use?

Navien new NFC-H and NCB-H are the ultimate high efficiency condensing combination boilers with the capacities to supply both heat and domestic hot water for larger homes — enough space heat for a whole house, plus hot water to run up to 3 showers and a dishwasher all at the same time.

How many hot water radiators are in a combi navien?

I know the Navien is a Combi but the CH-240 is 199,000 BTU. Isn’t that overkill? My house has one zone with 10 hot water radiators about 4ft each average. I ask the plumber to do the setup so I can add another zone for when I refinish the basement. But the basement is only about 500sf.

When did navien start making tankless water heaters?

Navien is best known as a leader in the tankless water heater market. The technology for boilers is similar, so making tankless Navien boilers is a natural fit for the company. The company started in Japan in 1978. It has been making products for the North American market since 2006,

How does the navien heat exchanger reduce CO 2?

Navien fire tube condensing stainless steel heat exchangers recover additional heat from the flue gases contributing to reduced energy consumption and lower CO 2 emissions. Resulting lower exhaust temperatures allow for the use of inexpensive venting materials such as PVC Schedule 40 in almost all applications.