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Free Hot Water Blog
Archive for May, 2010
Information Needed to Assess Solar Hot Water for Laundromats
Monday, May 31st, 2010 by Solar Fred
 Photo: Flickr/LivinginMonrovia
You run a Laundromat or other type of laundry service that uses lots and lots (and lots) of hot water every day to wash clothes, uniforms, restaurant and hotel linens, etc.
You’re noticing that utility rates are starting to creep up, eating into your profits, and  now you’re wondering how much it would cost to offset your bill with free hot water generated by solar collectors.
First of all, there is no “one-size-fits all” solar hot water system for Laundromats or any other commercial business. Homes are more predictable, but commercial solar hot water systems require specific information to design the most cost effective systems.
Here are just a few things that Free Hot Water’s solar thermal engineers will have to know in order to design a solar hot water system for a Laundromat or laundry service. Some of this information can be obtained by us through your utility.
Laundry Assessment Information Needed (Partial List)
- Type of utility. Are you gas? Electric? Oil? Steam? This information will be used for many reasons, including engineering and for estimating your utility savings over time.
- Hot water usage. Based on a number factors, we’ll need to obtain an estimate, how much gas or oil is used for hot water and how much is used for other functions, such as heating the building and for your facility’s dryers. .
- Monthly utility bills. It’s important to know patterns of usage during the different months and seasons. Solar hot water systems will produce more hot water during the summer, obviously. Systems must be designed to not overproduce during those months, while not under producing for the cooler seasons. As a result, the goal is to offset as much as 80% of your annual hot water needs.
- Types of washers. We’ll have to know about your washers. Do you have large industrial washers? Small residential? Front loaders or top loaders? How many of each do you have? How many gallons are used per load for each type of washer?
- Type of roof. We’ll have to know about your roof. Is it in good condition? How much area is available to install solar collectors? Also, is it a flat roof or slanted?
- Roof orientation. If the roof is oriented in a particular direction, at what direction? The best solar potential is achieved when the solar collectors face south. However, there are ways to compensate for any direction, especially when you have a flat rooftop. The angle or pitch of a roof is anther factor.
- Current storage tank area. We’ll need to know about your storage tank area. How far away is it from the roof? Is it on the roof? Wherever it is, is there room for another tank? Can we use your existing tank to incorporate solar hot water, or must it be replaced.
There are other details and data that need to be gathered in order to design an efficient and cost effective solar hot water system. The good news is that we can help you gather all of this information and give you a free solar hot water assessment.
If you have a Laundromat or other washing service, you have nothing to lose by contacting us for a free estimate. At best, we’ll show you your potential hot water savings by going solar. At worst, you’ll have a professional estimate and you’ll be able to benchmark yourself for another time when you’re ready to go solar.
Tags: Site Assessment, Solar Thermal/Solar Hot Water Posted in Hotel Solar Hot Water, Site Assessment, Solar Hot Water Value, Solar Thermal & Solar Hot Water News, Solar Thermal Training | No Comments »
Adding Solar Hot Water to Your Solar PV Business
Monday, May 24th, 2010 by Solar Fred
 Join us at the top! Become a Free Hot Water Installer!
Whether you’re concerned about increasing competition and decreasing rebates for PV, or you just want to add Solar Hot Water to your residential and commercial solar business, the team at Free Hot Water wants to give you everything you need to break into the solar hot water/solar thermal business.
Our new solar PV partner program designed for solar PV installers provides:
- On-site training for new commercial installers and distributors. We come to you.
- Our own highly-rated SRCC OG-100 Solar Collectors and components for commercial applications: hotels, apartment buildings, hospitals, car washes, laundry mats, and more.
- Experienced commercial design and engineering services. (All commercial solar thermal projects require engineering – we do it in house.)
- Access to financing for your customers.
If you’re a PV installer in California, then now is a very opportune time to expand your Solar PV business. The solar thermal market is expected to increase dramatically for several reasons:
- The 30% Federal ITC tax write off for Solar Thermal residential and commercial applications.
- The California CSI rebate program begins June 1, 2010 — $350 Million dedicated to Solar Hot Water.
- The 10 Million Solar Roofs and 10 Million Gallons of Solar Water Heating Act of 2010 creates rebates to cover up to half the cost of 200,000 water heating systems. Read a summary about the program here.
- With both Federal and State incentives, payback for Solar Thermal can be <5 yrs. for residential, and as little as 3 months for some commercial applications!
- The expansion of Property Assessed Clean Energy (PACE) programs allow residents and businesses to install Solar Hot Water with no money out of pocket.
Finally, no matter what state you live in, there’s a lot of great reasons to be expanding your services to include solar hot water:
- Increase profit margins by offering customers a complete package of solar PV and Solar Hot Water.
- Retain more leads by offering customers another way to go solar with an attractive ROI.
- Distinguish yourself from competitors by becoming a solar one-stop-shop authority that can provide solar solutions beyond PV, including radiant/hydronic heat and Solar Hot Water.
Free Hot Water is dedicated to helping our partner installers and distributors to grow their solar business. For more information, please contact us at info@freehotwater.com, or call us directly at 408-432-9900.
A Free Hot Water consultant will go over the steps to expanding your business into commercial and residential Solar Hot Water.
Tags: Solar Rebates, solar technology, Solar Thermal Training Posted in Solar Hot Water, Solar Hot Water Value, Solar Thermal Training | No Comments »
Solar Thermal 101: Calculating the Expansion Tank Size
Tuesday, May 18th, 2010 by Solar Fred
This is the seventh in a series of posts written by Free Hot Water’s co-founder and senior mechanical engineer, Gal Moyal. We’ll be posting this series every Wednesday, so please make it a date. Some of the information may be very technical, but if you have any questions at all, please feel free to contact us. We sincerely want to help. If you would like to have a more hands-on experience, explore our certified Free Hot Water training courses. –Solar Fred.
Calculating the Expansion Tank Size [Vet]
Through out the course of its life span, a closed loop solar hot water system will get exposed to wide temperature changes. To prevent the system from exceeding the pressure range allowed by the designer, there’s a need to “park” the fluid volume expansion.
To calculate the size of the expansion tank you will have to make the following calculations:
 Click to Enlarge
System potential expansion volume:
Va = 1.1(Vc+Vp)ά+Vc
Vά – Collector Expansion to be “parked”
Vc – Collector total volume
Vp – Collector Volume other than the collector
ά – Expansion coefficient (Water- .045 Glycol – 0.07)
Static Pressure at the relief valve location:
Pi = H(0.45)+7
Pi- Pressure at the relief valve location (PSI)
H – Height of collector above relief valve
To calculate minimum expansion tank needed:
Vet = Va [{Pf+14.7}/{Pf-Pi}]
Vet – Min expansion tank volume required
Va – System potential expansion volume
Pf -Â Relief valve max allowable pressure
Pi -Â Static pressure at relief valve location
If you’re an installer who wants more more information or a home or business owner interested in solar hot water, please email us at info@freehotwter.com, and one of our experts will walk you through the process.
Tags: How Solar Works, solar technology, Solar Thermal/Solar Hot Water Posted in How Solar Works, Solar Hot Water, Solar Thermal Training | No Comments »
Solar Thermal 101: Sizing Your Solar Water Heater Tank
Tuesday, May 11th, 2010 by Solar Fred
This is the sixth in a series of posts written by Free Hot Water’s co-founder and senior mechanical engineer, Gal Moyal. We’ll be posting this series every Wednesday, so please make it a date. Some of the information may be very technical, but if you have any questions at all, please feel free to contact us. We sincerely want to help. If you would like to have a more hands-on experience, explore our certified Free Hot Water training courses. –Solar Fred.
Sizing Your Solar Water Heater Tank
The simple rule of thumb is that on average, you should consider 1.5 gal of hot water storage for every square foot of solar panel installed.
For example every FHW-FC7275 collector has 25.25 sq ft of active area (the “aperture area”). Therefore, on average a system with two FHW-FC7275 should have a 75 gal storage tank capacity.
Please note that this type of calculation is a rule of thumb and is only intended to give you a good “ball park” number. In reality, storage capacity should be calculated based on:
- Heat production capacity of the solar array
- Insolation
- Water usage patterns
- Desired water temperature
- System type
 Free Hot Water Internal Coil Storage Tank
If you’re not sure of the storage capacity you need for solar hot water home or business, please email us at info@freehotwter..com and one of our experts will walk you through the process.
Posted in Solar Thermal & Solar Hot Water News, Solar Thermal Training | No Comments »
Solar Thermal 101: SRCC Collector Ratings and What They Mean
Tuesday, May 4th, 2010 by Solar Fred
This is the fifth in a series of posts written by Free Hot Water’s co-founder and senior mechanical engineer, Gal Moyal. We’ll be posting this series every Wednesday, so please make it a date. Some of the information may be very technical, but if you have any questions at all, please feel free to contact us. We sincerely want to help. If you would like to have a more hands-on experience, explore our certified Free Hot Water training courses. –Solar Fred.
SRCC Collector Ratings
In our previous posts, we’ve been talking about the different types of solar hot water collectors. We’ve discussed evacuated tube collectors and flat plate collectors. However, all solar thermal collectors are not created equal, and that’s why we have the SRCC ratings.
Any quality collector sold in the United States is examined and approved by what’s commonly known as the SRCC, which stands for the “Solar Rating and Certification Corporation.” States such as California will only issue rebates to collectors and complete systems that have been rated by the SRCC.
And who is the SRCC? The SRCC is an independent agency that administers a certification, rating, and labeling program for solar hot water collectors. They also have a similar program for complete residential solar water heating systems.
- Solar thermal collectors have what’s known as an “OG-100″ certification. These can be used on any roof with a custom installation. Apartment buildings, hotels, laundry mats, car washes, and hospitals all require custom installations that include OG-100 panels.
- Complete solar water heating systems that include OG-100 solar collectors, storage tank, and other components have an “OG-300″ certification. Residential systems don’t typically need custom engineering, which is why most residential systems are sold as complete SRCC rated kits.
All equipment that the SRCC certifies and rates is required to bear a certification label, which shows the performance rating for that product. In addition, each certified product is published by SRCC in a directory.
Each product’s directory listing contains information on the product’s material and specifications as well as the certified thermal performance rating. For example, our Free Hot Water 7000 and 5000 and 4000 series are all OG-100 certified.
See the label for our 7000 series specifications and how the collector performed on sunny days, cloudy days, and other specifications. You can then compare Free Hot Water solar collectors to other certificates from other brands and make an apples to apples comparison of performance and the materials used to make the panels
 (Click to Enlarge)
As always, if you have any questions at all, please contact us. We genuinely want to help you decide whether solar hot water is right for your home or business.
Posted in How Solar Works, Solar Hot Water, Solar Thermal Training | No Comments »
The Three Main Reasons People Want Solar Hot Water for Their Home
Sunday, May 2nd, 2010 by Solar Fred

At Free Hot Water, our customers have different reasons for wanting to go solar now. It used to be that people chose solar hot water for their home as a lifestyle choice. Today, the reasons include lifestyle, but go way beyond that. Here are three reasons we hear most often:
1) There are new solar hot water rebates and incentives.
Thanks to Federal and local incentives, solar hot water systems have never been more affordable. With lower up front costs and faster payback, there’s very little reason not to go solar if your home or apartment building has the right conditions for solar hot water.
- Use our solar hot water calculator to see an estimate of much money solar will cost and save you.
- Check the list of Federal and state solar water heating rebates available in your area. Today, residential solar hot water systems receive an uncapped 30% federal investment tax credit.
- Or skip the above and simply contact us for a free, no obligation quote. We’ll fill you in on all of the incentives available in your area and give you a precise quote for your home.
2) People want to reduce their carbon footprint and environmental pollutants.
Regardless of whether or not you believe in man-made global warming, gas, oil, propane, and electric hot water do emit mercury, CO2, or other pollutants into the air, increasing the risk for asthma, certain types of cancer, and other negative health effects.
Then there are the environmental cost of coal mining and oil and gas drilling, including off shore oil spills, water contamination, and coal mining disasters. Here are some facts:
- A family of four consumes an average of 3,684 Kilowatts of electricity to heat water.
- For every 1kWh of energy produced by a coal-fired power station, 2.2 pounds of CO2 is produced. Therefore, the above family releases 6.4 metric tons of greenhouse gases annually for heating water.
- In comparison, the family car will emit half as much pollution over the same period of time!
- Calculate your own carbon footprint with our Carbon Dioxide Emissions Calculator.
Many customers feel that switching to solar hot water is one way to do their part to reduce emissions and demand for these energy sources. Here’s how solar hot water can be an affordable solution:
- A solar hot water system can eliminate 80% of annual hot water heating energy needs, substantially reducing your gas or electric bill and the associated environmental impact.
- In fact, during the summer, a solar hot water system will provide 100% of your hot water needs.
- Solar thermal systems can now be designed to offset your homes heating and air conditioning, further reducing your carbon foot print.
- Specifically, the above family could reduce their carbon footprint by 5.2 metric tons annually, using a high efficiency solar system by Free Hot Water.
3) People want more energy independence.
Many customers are frustrated by rising utility rates and feel they have no way to stop those increases. Purchasing a solar hot water system is one way to lock in rates for the next 20 to 25 years without worrying about rate increases.
- Keep in mind that most residential solar hot water systems will be backed up by the utility. But as mentioned above, 80% of your annual hot water needs can be eliminated from the utility’s books, and instead put that savings into your pocket.
- Free Hot Water solar systems are a mature, reliable, low-maintenance source for hot water.
- Free Hot Water residential solar thermal kits come with a 10 year limited warranty, but typically last for 20 to 25 years! How’s that for energy independence?
Whatever your reason for going solar, please contact us if you have any questions or would like a free evaluation of a solar hot water system for your residential or commercial application.
Posted in Solar Hot Water Value, Solar Thermal Economics | No Comments »
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