Radiant Floor Heating with a Tankless

tankless radiant floors

We are receiving an ever increasing number in inquiries regarding the installation of tankless water heaters and radiant floor heating.  There are a number of reasons why and we hope to fully explain them below.

Conventionally radiant floor heating was done with a boiler which is large and very expensive.  Today’s technology has brought us tankless water heaters which are small enough to hang on the wall yet more powerful than ever.

Benefits of using a Tankless for Radiant Floor Heating

  • A Tankless is cheaper to buy
  • Space saving size
  • Powerful enough to provide heating as well as domestic hot water needs
  • Built in circulation pump
  • A single system can heat homes up to 3000sq feet
  • High efficiency systems (98%)

Why is radiant floor heating so nice?

Having your floors heated provides a completely different feel and comfort level within your home.  Have you ever unknowingly walked by something hot and felt that faint sensation of heat but not know where it’s coming from.  Well radiant floors are similar in a sense, and heat is released evenly throughout your home.

Radiant floor heating is much more efficient than forced air.  The floor has a much greater thermal mass and thus releases the heat slowly and evenly when heated radiantly.  A forced air furnace indirectly tries to heat your home by heating the air.  This hot air rises and in fact works to heat your roof.

Installation

Radiant floors can now be installed under tiles, hardwood, and even laminate.  The tubing is pre-made and carries a long guarantee (depends on brand).   Let us come out and give you a free quote to install radiant floor heating in your home.

 


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Home Heating With A Tankless

home heating tankless

We have a roughly 2000 sq foot home just North of Toronto.  Our combined average costs for heat and hot water are only $20 per month, a figure we credit to tight construction, increased insulation, programmable thermostats, and the efficiency of our Rinnai tankless water heater.

Yes, most radiant systems get their hot water from either a normal water heater or a boiler, our homes hot water and heat are both provided by a high efficiency Rinnai  — or “on demand” — tankless.  The Rinnai RU98i uses considerably less energy than a tank-type heater and costs less to install than a boiler with a heat exchanger.

Heating With A Tankless

Tankless water heaters are a proven technology with a long track record for heating domestic hot water in Southern Ontario.  Unfortunately few contractors in our area  have experience using them for radiant or home heating with a tankless, and thus information about reliable system design can be hard to find.

We consider our home system more than worthwhile: During the three years we have had the system, heat and hot-water costs for two people have averaged around $20 per month.

It’s important to note that we have added additional insulation (R-35 walls, R-50 to R-60 in the roof) and our large windows help us take advantage of excellent solar thermal energy. When the sun is out, which it often is here, we barely need any heat at all during the day.  On occasion we also supplement our homes heating with a wood stove, which we enjoy for both comfort and ambience.

Finally, we use a programmable thermostat that limits the temperature to 62°F in the middle of the day and at night, and 70°F from 6 to 8 a.m. and 6 to 10 p.m.

Why Tankless?

Tankless water heaters take up very little space, are extremely efficient, and offer endless hot water.

Despite the fact that the units are not commonly used for home heating, they’re an ideal heat source for this application because their output temperatures can be easily matched to the needs of the radiant or hydronic system. With a heating controller the Rinnai tankless can provide water of up to 180°F, which is more than sufficient for the 110°F to 120°F needed to run radiant system.

The economics of using a tankless water heater to supply both hot water and home heating are also quite attractive. Total cost for a system like this is around $5,000, this includes a tankless, labour, the PEX tubing, and various components, controls, and fittings.

You can use a tank-type water heater for a little less cash upfront but the extra cost of the tankless model will more than offset extra cost with its energy savings. Energy efficiency of a heating appliance is expressed as a decimal called its energy factor, or EF.  A tankless water heater has an EF between .82 and .97, which means it converts 82 percent to 97 percent of its energy input to heat.  Conventional tank type units have an EF around .59, so a good 40% of money you spend on heating is simple pumped out the exhaust pipe.