
For the average homeowner, approximately 20 percent of total energy expenditure can be attributed to water heating. Over time, the price of keeping warm water flowing will add up, and it’s probably in your best interest to compare the water systems available and ensure that you’ve got the option in place that best suits your needs.
When comparing traditional and tankless hot water systems, there are significant differences to note between the two, including cost, efficiency, size, warranties, and more. Below, we’ll explore some of these differences, alongside similarities, between the two most common hot water tank systems available.
Whether you’re looking to upgrade from an old tankless system or transition from a traditional hot water tank, our team is here to help. Thermenergy is an industry leading installer of Tankless Hot Water Systems in the GTA, successfully equipping over 150 clients each year with the tankless hot water systems they need to warm the water in their homes. For more information about tankless water heaters please check our all you need to know about tankless water heaters blog,
Tankless Condensing Water Heaters

NPE A2 SERIES
- 2" PVC up to 75 feet and 1/2" gas up to 24 feet
- High efficiency up to 0.95 UEF and up to 15:1 TDR
- Durable dual stainless steel heat exchangers
- EZNav™ multi-line control with built-in intuitive software

NPE S2 SERIES
- 2" PVC up to 75 feet and 1/2" gas up to 24 feet
- High efficiency up to 0.96 UEF and up to 15:1 TDR
- Durable dual stainless steel heat exchangers
- EZNav™ multi-line control with built-in intuitive software
Tankless Non-Condensing Water Heaters

NPN-U SERIES
- Patented NaviTech™ stainless steel heat exchanger
- Stainless steel burner with lean/rich stable cleaner burning technology
- 0.81 UEF for all models
- NPN-Universal is the only non-condensing unit that can be used inside or outside
- Strong residential and commercial warranties
- NaviVent™ concentric 3" x 5" venting

NPN-E Series
- Patented NaviTech™ stainless steel heat exchanger
- Stainless steel burner with stable cleaner burning technology
- 0.81 UEF for all models
- NPN-E is specifically designed for outdoor use only
- Strong residential and commercial warranties
- NaviVent™ concentric 3" x 5" venting
Condensing Combi-Boilers

NFC-H Series
- Dual inputs of 210,000 BTU/H for DHW and up to 199,900 BTU/H for heating
- Space saving and light weight design
- Dual Venturi and field gas convertibility
- Easy access to DHW module and valves
- Low noise levels
- TDR 15:1 for heating and for DHW

NCB-H Series
- Highest DHW maximum BTU’s in residential combi-boilers up to 210,000 per hour
- Highest DHW flow rate @ 70°F rise up to 5.4 GPM
- Highest number of BTU sizes for the North American residential combi-boiler market
- Highest residential combi DHW TDR 15:1 for all models
- Highest residential combi heating TDR up to 11:1
- Highest number of built-in zone controls for valves or pumps up to three
Condensing Heating Boilers

NFB-H Series
- Advanced user interface with intuitive text display and Quick Dial Wheel for easy navigation
- Common venting up to 8 boilers
- Built-in 3 zone pumps or 3 zone valves powered connections
- Easy access to DHW module and valves
- Compact, light weight, wall hung design saves space over traditional floor standing boilers
- Up to 15:1 turndown ratio

NHB Series
- Navien innovation in a compact wall-hung condensing boiler
- NHB Integrated control
- Adjustable heat capacity
- Freeze protection
- Manifold Kits
- Field gas convertible

NFB-C Series
- Lower operating costs with the industry’s leading thermal effciency at TE 97.5%
- Cascading and common venting capable
- Best-in-class training and technical support
- One of the industry’s best warranties
- BMS connectivity (Modbus, BACnet and LonWorks)
- Robotic and automated manufacturing technology for unmatched quality control
Hot Water Tank | Tankless system | |
---|---|---|
Cost | Hot water storage tanks must keep water hot at all times, and require a minimum temperature of 140 degrees Fahrenheit to prevent diseases such as legionella. This constant temperature moderation means that you’ll be using more energy to keep water warm and increase your energy bill in the process. | Tankless systems work to provide hot water on demand and will only consume energy when needed. The systems will idle until water is drawn, resulting in a decreased operational cost. |
Efficiency | 65% to 85% efficient. This means that for every $1 you spend on energy, 15-35 cents of it will be wasted. | 97.5% efficient. This means that for every $1 you spend on energy, 2-3 cents of it will be wasted. This is a major efficiency boost when compared to traditional hot water tanks. |
Capacity | Limited. Hot water tanks can only provide heat to a maximum of 65% of their capacity. As an example, a 50-gallon tank can only provide a maximum of 32 gallons of hot water each hour. | Unlimited. Tankless systems can provide heat to 100% of their water capacity. As an example, a 50-gallon tank can provide a maximum of 50 gallons of hot water each hour, a major improvement over traditional hot water tanks. |
Size | Large. Hot water tanks are big in size and require floor space in your home. | Small. Tankless systems are compact in design and hung on a wall, requiring no floor space. |
Life Expectancy | 10 to 15 years. Once a hot water tank begins to wear and leak it becomes unfixable and must be replaced. | 20 years. Tankless systems are repairable over their lifetime and can last for 20 years or more if maintained. |
How Tankless Hot Water Systems work:
- As hot water taps are opened, water in the home will begin to run through the tankless system.
- As the water moves through the system, flow sensors will activate. This causes the ignition assembly to fire up.
- Once the ignition assembly is live, the combustion blower will start and the main control will check for safety and activation igniters.
- Once complete, the gas valve will open and allow for a steady flow into the combustion chamber. This supply of gas will be the exact amount needed to create a constant flow rate.
- Once the gas is flowing, the igniter will trigger and begin to heat up the water that is flowing through the heat exchanger tubes.
- The water will continue to flow through the primary and secondary heat exchanger tubes, absorbing the heat produced by the burners as it continues to circulate
- The system's main control will actively monitor the temperature of the water flowing from the tankless system and will adjust the gas valve as needed to ensure stable temperatures.
- Following successful temperature moderation, the water will arrive at the designated faucet at a temperature and flow rate that is consistent with the end user’s specifications.

The image will better explain how tankless hot water systems operate

It is crucial to design your tankless system as per your need of hot water system, to make sure you get hot water all the time even at any temperature of city main water. Our specialist can help you design and will explain the installation of tankless system
Benefits of Tankless Hot water system
- On Demand : These units heat water only when you turn on the faucet. They usually operate on natural gas or propane. The main advantage is that they eliminate the extra cost of keeping 40 to 50 gallons of water hot in a storage tank, so you waste less energy.
- High Efficiency: Tankless are upto 98% efficient which saves you on energy bills, compare to 70% eff. conventional hot water system.
- Space: Tankless are compact in size and installed at wall so it saves you lots of floor space which can be used for storage or other purpose.
- Water quality: Tankless has facility to flush sediment and scale built up for better quality of water.
New Installation
Are you running out of hot water in shower?
Is your hot water need increased?
Don’t worry we can help design right tankless system just for your needs.
We will also drop off / scrap your old tanks to rental company.
5 years free protection on Tankless system
We have monthly finance or rental option for ease of payment.
We have monthly finance or rental option for ease of payment.
Why choose ThermEnergy?
Free consultation: Our expert will help you choose right product for your needs, explains warranty and protection plans, government rebates, and installation details at no cost.
Same day Installation: We understand how uncomfortable if HVAC system doesn’t work, we guarantee your installation within 24hrs.
Top of line products: We only recommends you most efficient, reliable and perfectly matched system for your needs.
Team of Experts: Our techs, installers are best in industries with lots of experience, licensed and insured. Who will make sure your system works safe, efficiently and reliable.
Warranty: We back our product and installation with extended warranties for part and labor. 10 year protection plan available.
Ease of Payment: Provides monthly finance, rental or deferral options at very low interest rates.

Service plan for Heating and Air conditioning

Furnace
Maintenance Plan
Includes
- Once a year in fall complete service
- Carbon monoxide testing
- Heat Exchange inspection
- 24/7 Customer Support
- 20% discount on repair
- Service test report
Protection Plan
- Unlimited visit for repairs
- 24/7 support
- Covers frequently failing parts
- Majority of parts covered
- 30% Discount on new replacement.
- Service test report
Comfort Coverage
Maintenance + Protection
- Covers both Maintenance and protection plan.

Air Condition
Maintenance Plan
Includes
- Once a year in fall complete service
- Also includes Condenser coil clean up
- 24/7 Customer Support
- 20% discount on repair
- Service test report
- Tune up for best performance
Protection Plan
- Unlimited visit for repairs
- 24/7 support
- Covers frequently failing parts
- Majority of parts covered
- 30% Discount on new replacement.
- Service test report
Comfort Coverage
Maintenance + Protection
- Covers both Maintenance and protection plan.

Furnace + Air Condition
Maintenance Plan
Includes
- Complete service on fall and spring
- 24/7 Customer Support
- 20% discount on repair
- Service test report
Protection Plan
- Unlimited visit for repairs
- 24/7 support
- Covers frequently failing parts
- Majority of parts covered
- 30% Discount on new replacement.
- Service test report
Comfort Coverage
Maintenance + Protection
- Covers both Maintenance and protection plan.
Protection Plan Terms & Conditions
Your Consent Regarding Information:
You consent to our collection of your credit, financial and related personal information, and to the exchange of this information between us, credit bureaus, financial institutions, our subsidiaries and affiliates and other persons with whom you have had or may have financial dealings, and to our use of this information for the purposes of: verifying and evaluating your creditworthiness and other information you provide to us in connection with your account (including verifying your identity for regulatory compliance purposes); establishing, servicing and collecting on your account; providing the products and services you request; providing credit references; communicating with you for these purposes; and meeting legal, regulatory, audit, processing and security purposes, and as otherwise permitted or required by law. In addition to the purposes above, we and our affiliates assume that you consent to our use of your contact information to provide you with occasional information about other products and services offered by us or our affiliates.
*CUSTOMER REWARDS
As a Protection + Maintenance Plan customer, you may be eligible for certain exclusive benefits and offers. To inquire about the benefits and offers that may apply to you, please contact us. Thank you for choosing ThermEnergy Heating and Cooling Inc. We look forward to meeting your home comfort needs.
OTHER TERMS
- We will not reimburse you for the costs of services or parts replacement performed by contractors that have not been authorized by us.
- Except as specifically provided, your plan coverage is non-refundable. Your plan coverage is not transferable to another residence.
- We have the right to change, from time to time, any term that applies to your plan, including any plan rates and charges, by sending you prior notice of the change and such change will be effective 30 days after the date set out in that notice.
- We may sell, assign or otherwise dispose of, or grant a security interest in, all or part of our right and interest in this agreement to anyone else, without notice to you or your consent. To the extent not prohibited by law, you will not assert against any transferee any claims, defences, set-offs, deductions or counter-claims which you may now or in the future be entitled to assert against us. The costs of redecoration and restoration costs required as a result of any work performed in connection with any of the Plans are not covered. This includes wall-coverings, drywall, plaster, wallpaper, paint, floor coverings, tile, cabinetry, countertops, landscaping or repair of any structural or cosmetic defects.
PROTECTION PLANS – TERMS AND CONDITIONS SERVICES COVERED
Heating/Cooling Protection Plans:
Cover the diagnosis and repair, replacement or adjustment, as we determine necessary, of specified parts within your “heating unit” (if your plan includes a “Heating Protection Plan”) and “cooling unit” (if your plan includes a “Cooling Protection Plan”) subject to the exceptions noted below. For parts and services included in the Heating/Cooling Protection Plans, you are protected from all labour and part replacement costs, up to the limits described below.
EQUIPMENT COVERED
Heating Protection Plans:
Covers one of the following: residential natural gas furnace, space heater, air handler, heat pump, or high velocity unit (the “heating unit”). Equipment using conversion burners, the conversion burner itself, fireplaces and ductless or wall units are not eligible for coverage. Equipment serving more than one dwelling unit is not eligible for coverage. Heating equipment that heats using electricity or a fuel other than natural gas (e.g. oil, propane, wood, etc.) is not eligible for coverage.
Cooling Protection Plans:
Coverage for a residential electric powered central air conditioning unit, heat pump or high velocity air conditioning unit (the “cooling unit”). Natural gas powered, ductless or wall units are not eligible for coverage. Equipment serving more than one dwelling unit is not eligible for coverage.
Heating/Cooling Protection Plus Plans:
Cover the same equipment as the Heating/Cooling Protection Plans.
PARTS COVERED
Heating Protection Plans:
- Gas Burner and Orifices
- Gas Burner and Orifices
- Automatic Gas Control Valves
- Gas Regulator
- Electric Ignition System
- Relay
- Flame Spreader
- Pilot Burner
- Thermocouple/Generator
- Fan and Limit Controls
- Heating Circuit Transformer
- Venter Motor Assembly
- Roll Out Switch
- Vent System Pressure Switch
- Condensate Pump
- Furnace Low Voltage Circuit Fuse
- Automatic Vent Damper/Motor
- Aqua Stat Controls
- Flow Switch
- Pulley and Belt
- Door Switch
- Summer/Winter Switch
- Thermostat (other than Wi-Fi enabled thermostats)
The following parts are excluded from coverage under your plan: heat exchanger, blower motor, main control board, heating coil (air handler), heating sections (boiler), firebox/combustion chamber, furnace filters, low and high water cut-off valves, circulating pumps, zone valves, Wi-Fi enabled thermostats and parts added on to accommodate ancillary equipment such as air conditioners, humidifiers, etc. Replacement of the complete heating unit is not covered under any of these plans.
Cooling Protection Plans:
The following is a complete list of parts covered by your Comfort Cooling Protection Plan:
- Add-On Fan Centres
- Capacitor
- Line Components
- Internal Copper Tubing
- Low Ambient Temperature Sensor
- Add-On Indoor Fan Relay
- Cooling Contactor/Relay
- Evaporator Coil
- Internal Electrical Wiring
- Condenser Fan Motor
- Thermostat (other than Wi-Fi enabled thermostats)
- Fan Blade
- Pressure switch
- Service valve
The following is a complete list of parts covered by your Comfort Cooling Protection Plan:
- Add-On Fan Centres
- Capacitor
- Line Components
- Internal Copper Tubing
- Low Ambient Temperature Sensor
- Add-On Indoor Fan Relay
- Cooling Contactor/Relay
- Evaporator Coil
- Internal Electrical Wiring
- Condenser Fan Motor
- Thermostat (other than Wi-Fi enabled thermostats)
- Fan Blade
- Pressure switch
- Service valve
The following are exceptions from coverage under your plan: compressor and condenser coil replacement, leak repairs, freon charge, and Wi-Fi enabled thermostats. Repairs required within the furnace or air handler are not covered by the Cooling Protection Plans but are included in the Heating, or Heating/Cooling combined Protection
BILLING AND PAYMENT
Your bill will be sent by us to you on a quarterly basis or, if permitted by us, on a monthly basis. Your charges are due 15 days after the bill issue date on your bill. A bill may not be sent to you if we believe that you have a credit balance. For your convenience, we have arranged the various payment options. Your payment may be made by cheque or money order payable to ThermEnergy Heating and cooling inc. and, so long as there is no interruption in postal service, sent by mail to ThermEnergy Heating and cooling inc, Unit 26, 151 Nashdene Rd, Toronto, ON M1V4C4. Your account number should be included on the front of your cheque or money order. Cash should not be sent through the mail. Payments may also be made through a financial institution in the manner of your choice (including paying at an automated teller machine, through telebanking or internet banking). If you have authorized us to have your payments deducted from your bank account (a pre-authorized payment or “PAP”), we will notify you 15 days prior to the first PAP. You will only receive another bill if the amount of the PAP changes. On approximately the same day (a “PAP Date”) each quarter or, if permitted by us, each month, the charges set out on your bill are due and we will debit the account identified in the banking information you have provided (or any other account that you may identify to us from time to time) for those charges and all other amounts you owe us. If the PAP Date falls on a weekend or statutory holiday, your account will be debited on the next business day. You agree that we will not notify you in advance of each PAP. The Plan services are provided for your personal use. You may cancel this authorization upon 30 days written notice to us, however, you remain obligated to pay all amounts due or owing under your Plan. You have certain recourse rights if any debit that we draw does not comply with this authorization. For example, you have the right to reimbursement for any debit that is not authorized or is not consistent with this authorization. For more information on your right to cancel a PAP debit agreement or on your recourse rights, contact your financial institution or visit www.cdnpay.ca. You will pay us on demand interest on all amounts payable by you (including interest) and not paid when due, both before and after judgment, at a rate equal to 1.5% per month (or 19.6% per annum), compounded monthly. You will be charged $25 for any cheque that is returned unpaid by your bank or for any PAP that cannot be processed for any reason. If more than one customer is named on the front of your bill, you understand that each of you is individually liable, and all of you are collectively liable, for all obligations imposed on you by this Agreement.
NOTICE OF CHANGES
You agree to promptly inform us of any change of your mailing address at least 30 days in advance of such change. If you have chosen to make your payments under this Agreement by PAP, you must inform us in writing of any changes in the bank account information you provided. Notice of any change should be sent to us ThermEnergy Heating and cooling inc, Unit 26, 151 Nashdene Rd, Toronto, ON M1V4C4) or visit us at www.thermenergy.ca
UNAVAILABLE PARTS and PART REPLACEMENT
If a part is unavailable, we will attempt to obtain a replacement part or an equivalent substitute as quickly as possible, but limited availability of certain parts may result in delays from time to time. In the unusual event that we cannot provide a part replacement or an equivalent substitute, we will not be liable for such part replacement, equivalent substitute or for any resulting damages. Parts replacement or equivalent substitutes are solely at our discretion. Any part that is found to be defective and is replaced under your plan coverage becomes our sole property and may be disposed of at our discretion.
LIMIT ON LIABILITY
We are not the manufacturer or supplier of the heating unit, the cooling unit, we make no representations, warranties or conditions as to the performance of such equipment or system. We will not be liable for any loss, damage or injury of any type arising out of or related to your Plan or caused or contributed in any way by the use and operation of the heating unit, the cooling unit any indirect, incidental, special or consequential damages, even if reasonably foreseeable. If we are not able to perform any of our obligations under this Agreement because of circumstances or events beyond our control, we shall be excused from the performance of such obligations for the duration of such circumstances or events and we shall not be liable to you for such failure to perform. These plans are not insurance and do not cover any losses, repairs or replacements arising from abuse, accidental or deliberate damage, theft, vandalism, fire, flood, freezing, earthquake, other natural disasters, acts of war, acts of God, unauthorized repair, if the equipment has been turned off, improper thermostat setting, or household electrical problems. You will indemnify us from all claims, losses, and costs that we may suffer or pay, or may be required to pay, including legal expenses, in connection with the heating unit, the cooling unit, the plumbing and drain system, your Plan or the use and operation of either the system or unit, including any claims against us for any injury or death to individuals or damage to property. You will pay, when due, all taxes and other charges imposed by any governmental authority on or in connection with this Agreement or your payments made under it.
Your plan will become active 15 days after your enrolment.
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