Electric Space Heaters and how to size one properly

During a cold weather spell you may need to subsidize your heating with an electric space heater. Do you have a drafty room or need to add heat just to help keep your pipes from freezing or have an area that does not have enough BTU's from you current heating system?  If so, do you know how to size a unit for your application?  The following information will help:

How to properly size an electric heater:

1) Measure the length and width of the room to determine total square footage.

2) Select your level of insulation

•Poor - Little insulation (Older homes) - 12.5 watts per foot

•Average - R-11 in walls and R-19 in ceiling - 10 watts per square foot

•Full - R-19 in walls and R-38 in ceiling - 7.5 watts per square foot

3) Make adjustments as necessary.

•For ceilings above 8 feet - increase wattage by 25% for every additional 2 feet in height

•Use a minimum of 1000 watts in a bathroom

•If a recommended wattage falls between two sizes - select the large heater

•For colder climates (prolonged winter temperatures below 20°F) use the next higher wattage up to 15 watts per square foot

4)  Use the chart below to calculate the recommended wattage or calculate it yourself with this example:
A room that is 10 feet wide by 13 feet wide with an 8 foot ceiling and Average insulations =  10 x 13 = 130 then 130 x 10 watts/per square foot = 1300 Watts

Room Size (Sq Ft with 8 foot ceiling)	Watts (Poor Insulation)	Watts (Avg Insulation)	Watts (Fully Insulation)
20 square feet	250	250	250
40 square feet	500	500	500
60 square feet	750	750	450
80 square feet	1000	1000	750
100 square feet	1250	1000	750
120 square feet	1500	1250	1000
140 square feet	1750	1500	1250
160 square feet	2000	1750	1250
180 square feet	2250	2000	1500
200 square feet	2500	2000	1500
220 square feet	2750	2250	1750
240 square feet	3000	2400	2000

Please Note: All these numbers are for general information - each install will vary depending on many other fact

To calculate the Watts to BTU click on the link below....

http://www.houseneeds.com/learning-center/electric-space-heater-install-information/watts-to-btu-calculator

 

For product information go to the below link to select the heater that will meet your needs.

 

http://www.houseneeds.com/heating/electric-space-heaters

 

Or call us at 866-432-8123 ask for sales

Electro Mini-Boiler WarmFlo H Series

This model is designed for multiple temperature and zoning applications. This model has the ability to sense water temperature and maintain an accurate boiler temperature output by only energizing the electric elements for needed output (not full capacity). To learn more about this concept read WarmFlo. This model eliminates extra costs associated with relays, extra temperature controls, zone boxes, etc. Our more experienced installers use this boiler to avoid the extra cost of the above components.

Models Available:

Model #	Volts	Watts	Amps	kW	Phase	Btu/h	CB
EMB-H-5	240	4,500	18.75	4.5	1-60	15,358	30A
EMB-H-7	240	7,000	29.17	7	1-60	23,891	45A
EMB-H-9	240	9,000	37.5	9	1-60	30,717	60A

BL308	Mini-Boiler Literature
BL006	Electro-Boiler Literature
BL001	Boiler Accessories
BL003	Radiant Floor Heating
BL306	Mini-Boiler Specification Sheet

Electro-Boiler Warranty Statement

Features include:

• Easy installation
• WarmFlo sensing technology
• Built-in pump control relay
• Pressure temperature gauge
• Built-in load management
• Wall-mounted design
• Two level hi-limit protection-160° pipe protection
• Quiet operation
• 20-year element/vessel warranty
• 100% efficient

 

Typical radiant applications include:

• Multi-zone applications
• Multi-temperature applications
• Hot water baseboard/radiator systems
• In-floor heat - staple-up application
• Forced air hot water coil
• Apartments
• Condo’s
• Garages
• Shops
• Animal Barns
• Whole house by using one boiler per level
• Even Bus Shelters....

Give us a call at 866-432-8123 if you have any questions or to place an order.

Electro Mini Boiler for Radiant Heating

The Electro Mini-Boiler for radiant has more features and is easier to install and use than ever before. One of the best features of this new unit is it comes to you at a lower price tag, all while maintaining our high quality and reliability that you have come to expect from Electro Industries.

The focus of this new design is to provide the installer with an easy access control board, a smaller, more compact design, and built-in temperature control. All of these features add up to a boiler that is easier to use and install, which in turn saves you money.

Models Available

Model #	Volts	Watts	Amps	kW	Phase	Btu/h	CB
EMB-S-1	120	1,100	9.17	1.1	1-60	3,754	N/A
EMB-S-2	120	2,500	20.83	2.5	1-60	8,532	N/A
EMB-S-4	120	5,000	41.67	5	1-60	17,065	N/A
EMB-S-5	240	4,500	18.75	4.5	1-60	15,358	30A
EMB-S-7	240	7,000	29.17	7	1-60	23,891	45A
EMB-S-9	240	9,000	37.5	9	1-60	30,717	60A

Features include:

• Built-in temperature pressure gauge
• Built-in temperature sensor
• Square D circuit breaker (built-in disconnect circuit breaker)
• Temperature dial on front cover
• Indicator lights
• Easy access control board
• Compact design, 10-½”W x 8-⅝”D x 25”H
• 100% efficient

Standard equipment:

• Control wiring terminals
• DC power relays
• Hi-limits: 1st - automatic reset, 2nd - manual reset
• Circulator switching relay - 10-amp maximum
• Thermostat or end switch connection (R and W)
• Load management control provisions
• Heavy duty sheet metal enclosure
• 1 gal. steel vessel, ASME “H” Stamp (20-year warranty)
• Safety relief valve (30 PSI)
• Low watt density heating elements (20-year warranty)
• 2-year parts warranty
• Temperature range 90° F to 160° F
• ASME/CSA listings
• Made in the USA

BL308	Mini-Boiler Literature
BL006	Electro-Boiler Literature
BL001	Boiler Accessories
BL003	Radiant Floor Heating
BL306	Mini-Boiler Specification Sheet Give us a call at 866-432-8123 if you have any questions or to place an order.

MINI ELECTRIC TANKLESS WATER HEATERS - SMALL BUT POWERFUL



The Stiebel Eltron Mini^™ tankless water heaters are designed for installation at the point-of-use. The Mini^™ heats water instantaneously as it flows through the unit. Stand-by heat-losses are completely eliminated. The efficient heating elements are controlled by a simple flow switch. Additionally, all Mini^™ water heaters are equipped with a safety high-limit with manual reset.
 

Flow controls and faucet aerators are highly recommended in conjunction with tankless water heaters. The Mini^™ 2-1 is internally restricted to 0.32 GPM. The Mini^™ 2-1, 2.5-1 and 3-1 models ship with a 0.5 GPM pressure compensating flow reducer / aerator. The Mini^™ 3.5-1 and 4-2 models ship with a 0.66 GPM pressure compensating flow reducer / aerator. All aerators are designed to fit most common faucets. No pressure relief valve, drains, or circulating pumps are needed.
 
Applications
 



The Stiebel Eltron Mini^™ tankless water heaters are ideal for restrooms or kitchenettes in an office or commercial / industrial setting:
 
Office Buildings Gas Stations * Stores * Schools * Malls * Hotels / Motels * Warehouses  Commercial Condominiums * Restaurants * Manufacturing Facilities
 
In a residential setting, suitable for the following applications:
Bathroom Sinks * Kitchen Sinks Laundry Areas * Small Cabins * Boats / RVs
  

Low Flow = Big Savings
Flow controls and faucet aerators are highly recommended in conjunction with tankless water heaters. The Mini^™ 2-1 is internally restricted to 0.32 GPM. The Mini^™ 2-1, 2.5-1 and 3-1 models ship with a 0.5 GPM pressure compensating flow reducer / aerator. The Mini^™ 3.5-1 and 4-2 models ship with a 0.66 GPM pressure compensating flow reducer / aerator. All aerators are designed to fit most common faucets. No pressure relief valve, drains, or circulating pumps are needed.

 
Any questions call 866-432-8123 or
go to http://www.houseneeds.com/heating/tankless-water-heaters/stiebel-eltron-electric-tankless-water-heater-mini

How to size a buffer tank

The primary application of a buffer tank is to reduce heat pump, chiller, or boiler short cycling. Hydronic buffer tanks are used in systems operating below the design load condition, which is most of the time, or in systems having several low BTU cooling or heating loads calling at different times. This can cause the heat pump or the boiler to short cycle, resulting in reduced operating efficiency and shorter equipment life.
The primary application for the HF-22 BT is to reduce low-mass modulating, condensing boiler short cycling. The high and low left side connections are used for boiler supply and return. The top connection is used to supply the distribution system and the low right connection is the return from the distribution system. If the top connection is piped to the line supplying the air purger and vent, the tank will be self venting.

Buffer Tank Sizing - Calculating Capacity

 

The Heat-Flo buffer tanks are a simple, cost effective way to improve overall system operating efficiency by reducing

unnecessary equipment short cycling. The recommended capacity or volume of a buffer tank is based on four variables.

1. The duration of the heating or cooling source “on time”. (minutes)

The desired length of “on time” for each run cycle depends on the type of equipment used. Heat pump and

chiller manufacturers typically recommend a minimum of 5 to 10 minutes on time, and boiler manufacturers may

recommend a minimum of 10 minutes “on time”. Check with your equipment manufacturer. Generally, the longer

the on time, the higher the overall operating efficiency.

2. The minimum rate of heat input. (BTU/HR)

This is based on the heat pump or chiller output, or the boiler output at the minimum firing rate if the boiler has a

variable input system that ramps input down as the demand decreases.

3. The minimum system load (BTU/HR)

This is the demand placed on the system with the smallest zone calling for heat.

4. The allowable tank temperature rise. (deg. F)

This varies depending on the type of heating or cooling system used, and on the design of the distribution system.

Chillers may require a tight, (6 deg. F), differential to assure good dehumidification and prevent freezing, heat

pumps may require a 10 deg. F differential to maintain a high COP, and boilers with hydronic heating distribution

systems may require a differential anywhere between 10 to 40 deg. F depending on the application.

The following formula determines the tank volume:

V=T X (Q heat input - Q min. heat load)

Tank temp. rise X 500

V = Buffer tank volume (gallons)

T = desired heat source “on cycle” (min.)

Q heat source = heat source output (BTU/HR)

Q min. heat load = heat output to minimum load

Tank temp rise (deg.F)

Water to Water Heat Pump Example: Town and Country Mechanical wants a minimum heat pump on time of 10 minutes.

The heat pump output is 46,500 BTU/HR. The smallest zone is a 7,000 BTU/HR bathroom. The allowable temperature

differential is 90 to 100 deg. F for the radiant heating zones.

V=10 X (46,500 - 7,000) = 79.0 Gallons minimum volume. Choose the HF-80BT buffer tank.

(100-90) x 500

Click here to see a drawing of a buffer tank application.

Heat-Flo Indirect Water Heaters

What is an indirect water heater?

An indirect is a storage tank with a heating coil built inside the tank. Hot water from any hydronic heating boiler is circulated through the coil inside the tank to heat all the water in the tank. The unit is piped like any other heating zone.

Why use an indirect water heater?

An indirect provides abundant hot water, low operating cost, and long life.

Abundant hot water

The Model 40 takes the full output of a 150,000 BTU boiler giving you over 150 gallons per hour of hot water @ 90 degree F rise, continuous! This compares to only 20 gallons per hour for a typical 4.5 KW electric water heater, and only 33 gallons per hour for a typical gas fired water heater. The Model HF-40 1st hour rating is 190 gallons. For an electric water heater to produce 190 gallons 1st hour, it would need to be a 187 gallon tank!

Low operating cost

Increased boiler on time increases boiler efficiency, and since there is no center flue like gas and oil fired water heaters, standby losses are extremely low. Operating costs of 50% less than an electric water heater are common.

Long life

No direct flame reduces lime accumulation and there are no electric elements to burn out. The units are all stainless steel construction. If you are installing or updating a hydronic heating system, or have an existing hydronic heating system, the indirect water heater is the right solution every time! Say goodbye forever to hot water shortfalls and high electric water heating costs.

Indirect water heater features and benefits include:

·           All plumbing connections are located on top for an easy installation.

·           All stainless steel tank and smooth tube heating coil for long life.

·           Full 2" plus of insulation for an extremely low heat loss.

·           A thermoplastic jacket that will not corrode or dent.

·           Standard Honeywell control and well for reliability and easy service.

·           Quality brass drain and T+P valves are factory installed.

·           Conforms to UL STD 174, Certified to CAN/CSA STD C22.2 No. 110-94.

30, 40, 60, 80 and 115 gallon units are available to suit both residential and commercial applications.

The 80 gallon unit is the way to go with hot tubs, spas, and multiple baths. The 115 gallon unit can be banked in commercial applications and produce an enormous amount of hot water, a perfect single system solution for multiple unit housing.

http://www.houseneeds.com/heating/indirect-storage-hot-water-tanks/heat-flo-single-heat-exchanger